2. Guidelines for Mental Math 3 to 5 times per week 10 questions each test 5 seconds to answer each question Test is self corrected, results recorded name goes in for a draw (1, 2, 3 chances) If corrected incorrectly no chance to win during the next draw. If no red pen, no tickets for that day Strategies used will be discussed

3. Mental Math # 1 1)7000 + 300 + 40 + 3 = 2)9000 + 70 + 3 = 3)2000 + 50 + 400 + 4 = 4)50 + 4000 + 7 + 300 = 5)5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1 = 6)4 x 100 + 8 x 1 + 5 x 1000 = 7)50 000 + 3000 + 20 + 7 = 8)500 + 300 + 40 = 9)80 + 40 + 20 + 2 = 10)4000 + 500 + 3000 + 20 =

4. Mental Math # 1 1)7000 + 300 + 40 + 3 = 7343 2)9000 + 70 + 3 = 9073 3)2000 + 50 + 400 + 4 = 2454 4)50 + 4000 + 7 + 300 = 4357 5)5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1 = 5392 6)4 x 100 + 8 x 1 + 5 x 1000 = 5408 7)50 000 + 3000 + 20 + 7 = 53 027 8)500 + 300 + 40 = 840 9)80 + 40 + 20 + 2 = 142 10)4000 + 500 + 3000 + 20 = 7520

5. Mental Math # 2 1)500 + 3000 + 70 + 3 = 2)6000 + 700 + 3 3)2000 + 500 + 40 + 4 = 4)50 000 + 30 + 7 + 8000 = 5)3 x 10 000 + 1 x 1000 + 9 x 100 + 2 x 10 + 3 x 1 = 6)4 x 1000 + 2 x 1 + 5 x 100 = 7)200 + 300 + 20 + 5 = 8)500 + 500 + 400 + 24 = 9)40 + 60 + 20 + 70 + 30 = 10)4200 + 500 + 60 =

6. Mental Math # 2 1)500 + 3000 + 70 + 3 = 3573 2)6000 + 700 + 3 = 6703 3)2000 + 500 + 40 + 4 = 2544 4)50 000 + 30 + 7 + 8000 = 58 037 5)3 x 10 000 + 1 x 1000 + 9 x 100 + 2 x 10 + 3 x 1 = 31 923 6)4 x 1000 + 2 x 1 + 5 x 100 = 4502 7)200 + 300 + 20 + 5 = 525 8)500 + 500 + 400 + 24 = 1424 9)40 + 60 + 20 + 70 + 30 = 220 10)4200 + 500 + 60 = 4760

7. Mental Math # 3 1)90 + 7000 + 500 + 6 = 2)60 000 + 400 + 20 + 3 = 3)300 + 700 + 80 + 4 = 4)50 000 + 30 + 7 + 8000 = 5)3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1 = 6)4 x 1000 + 2 x 10 000 + 8 x 100 = 7)20 + 80 + 30 + 5 + 70 = 8)900 + 600 + 400 + 72 + 100 = 9)2000 + 8000 + 700 + 30 = 10)5100 + 900 + 70 =

8. Mental Math # 3 1)90 + 7000 + 500 + 6 = 7596 2)60 000 + 400 + 20 + 3 = 60 423 3)300 + 700 + 80 + 4 = 1084 4)50 000 + 30 + 7 + 8000 = 58 037 5)3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1 = 3962 6)4 x 1000 + 2 x 10 000 + 8 x 100 = 24 800 7)20 + 80 + 30 + 5 + 70 = 205 8)900 + 600 + 400 + 72 + 100 = 2072 9)2000 + 8000 + 700 + 30 = 10 730 10)5100 + 900 + 70 = 6070

9. Mental Math # 4 1)20 + 6000 + 400 + 7 = 2)50 000 + 9000 + 200 + 30 = 3)400 + 600 + 3 + 40 = 4)20 000 + 300 + 9 + 4000 = 5)5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1 = 6)7 x 1000 + 8 x 10 000 + 6 x 100 = 7)50 + 90 + 50 + 5 + 10 = 8)300 + 600 + 700 + 42 = 9)4000 + 500 + 500 + 33 = 10)3700 + 300 + 76 =

10. Mental Math # 4 1)20 + 6000 + 400 + 7 = 6427 2)50 000 + 9000 + 200 + 30 = 59 230 3)400 + 600 + 3 + 40 = 1043 4)20 000 + 300 + 9 + 4000 = 24 309 5)5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1 = 5372 6)7 x 1000 + 8 x 10 000 + 6 x 100 = 87600 7)50 + 90 + 50 + 5 + 10 = 205 8)300 + 600 + 700 + 42 = 1642 9)4000 + 500 + 500 + 33 = 5033 10)3700 + 300 + 76 = 4076

11. Mental Math # 5 1)200 + 60 000 + 4 + 70 = 2)50 + 80 + 90 + 20 + 10 = 3)400 + 600 + 3000 + 400 = 4)23 + 300 + 7 = 5)6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 = 6)9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x 10 = 7)9 + 7 = 8)90 + 70 = 9)139 + 7 = 10)390 + 70 =

12. Mental Math # 5 1)200 + 60 000 + 4 + 70 = 60 274 2)50 + 80 + 90 + 20 + 10 = 250 3)400 + 600 + 3000 + 400 = 4400 4)23 + 300 + 7 = 330 5)6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 = 6202 6)9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x 10 = 89 640 7)9 + 7 = 16 8)90 + 70 = 160 9)139 + 7 = 146 10)390 + 70 = 460

13. Mental Math # 6 1)500 + 20 + 500 + 80 = 2)30 + 80 + 70 + 10 + 10 = 3)200 + 800 + 30 + 400 = 4)51 + 3000 + 9 = 5)8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1 = 6)9 x 10 000 + 8 x 1 + 6 x 1000 = 7)7 + 5 = 8)70 + 50 = 9)127 + 5 = 10)330 + 37 =

14. Mental Math # 6 1)500 + 20 + 500 + 80 = 1100 2)30 + 80 + 70 + 10 + 10 = 200 3)200 + 800 + 30 + 400 = 1430 4)51 + 3000 + 9 = 3060 5)8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1 = 8344 6)9 x 10 000 + 8 x 1 + 6 x 1000 = 96 008 7)7 + 5 = 12 8)70 + 50 = 120 9)127 + 5 = 132 10)330 + 37 = 367

15. Mental Math # 7 1)48 + 21 = 2)53 + 34 = 3)34 + 52 = 4)456 + 120 = 5)438 + 340 = 6)629 + 310 = 7)400 + 231 = 8)456 + 42 = 9)381 + 405 = 10)705 + 220 =

16. Mental Math # 7 1)48 + 21 = 69 2)53 + 34 = 87 3)34 + 52 = 86 4)456 + 120 = 576 5)438 + 340 = 778 6)629 + 310 = 939 7)400 + 231 = 631 8)456 + 42 = 498 9)381 + 405 = 786 10)705 + 220 = 925

17. Mental Math # 8 1)430 + 53 = 2)510 + 87 = 3)349 + 220 = 4)456 + 440 = 5)352 + 527 = 6)600 + 350 = 7)434 + 231 = 8)156 + 420 = 9)321 + 45 = 10)615 + 224 =

18. Mental Math # 8 1)430 + 53 = 483 2)510 + 87 = 597 3)349 + 220 = 569 4)456 + 440 = 896 5)352 + 527 = 879 6)600 + 350 = 950 7)434 + 231 = 665 8)156 + 420 = 576 9)321 + 45 = 366 10)615 + 224 = 839

19. Mental Math # 9 1)974 + 23 = 2)320 + 29 = 3)341 + 208 = 4)677 + 320 = 5)425 + 563 = 6)60 + 322 = 7)400 + 231 = 8)424 + 424 = 9)333 + 425 = 10)610 + 220 =

20. Mental Math # 9 1)974 + 23 = 997 2)320 + 29 = 349 3)341 + 208 = 549 4)677 + 320 = 997 5)425 + 563 = 988 6)60 + 322 = 382 7)400 + 231 = 631 8)424 + 424 = 848 9)333 + 425 = 758 10)610 + 220 = 830

21. Mental Math # 10 1)543 + 253 = 2)841 + 200 = 3)128 + 331 = 4)415 + 363 = 5)52 + 315 = 6)400 + 200 + 387 = 7)398 + 502 = 8)260 + 540 = 9) 390 + 208 = 10) 111 + 111 + 111 =

22. Mental Math # 10 1)543 + 253 = 796 2)841 + 200 = 1041 3)128 + 331 = 459 4)415 + 363 = 778 5)52 + 315 = 367 6)400 + 200 + 387 = 987 7)398 + 502 = 900 8)260 + 540 = 800 9) 390 + 208 = 598 10) 111 + 111 + 111 = 333

23. Mental Math # 11 1)Five and three tenths = 2)Thirty two and four hundredths = 3)Seventy-seven thousandths = 4)Two hundred four and five hundredths = 5)Nine hundredths = 6)4 + 0.2 = 7)30 + 5 + 0.9 + 0.07 = 8)200 + 0.8 = 9) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 10) 3 x 100 + 6 x 0.01 =

24. Mental Math # 11 1)Five and three tenths = 5.3 2)Thirty two and four hundredths = 32.04 3)Seventy-seven thousandths = 0.077 4)Two hundred four and five hundredths = 204.05 5)Nine hundredths = 0.09 6)4 + 0.2 = 4.2 7)30 + 5 + 0.9 + 0.07 = 35.97 8)200 + 0.8 = 200.8 9) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 5.24 10) 3 x 100 + 6 x 0.01 = 300.06

25. Mental Math # 12 1)Nine and three hundredths = 2)Thirty two and four tenths = 3)Seven thousandths = 4)Three hundred and fifteen thousandths = 5)Nine hundredths = 6)5 + 0.2 + 0.06 = 7)300 + 50 + 0.9 + 0.04 = 8)20 + 0.08 + 3 = 9) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) = 10) 3 x 100 + 6 x 0.1 + 4 x 1 =

26. Mental Math # 12 1)Nine and three hundredths = 9.03 2)Thirty two and four tenths = 32.4 3)Seven thousandths = 0.007 4)Three hundred and fifteen thousandths = 300.015 5)Nine hundredths = 0.09 6)5 + 0.2 + 0.06 = 5.26 7)300 + 50 + 0.9 + 0.04 = 350.94 8)20 + 0.08 + 3 = 23.08 9) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) = 0.425 10) 3 x 100 + 6 x 0.1 + 4 x 1 = 304.6

27. Mental Math # 13 1)

28. 2)

29. 3)

30. 4)

31. 5)

32. 6)

33. 7)

34. 8)

35. 9)

36. 10)

37. Mental Math # 13 1) One and four tenths or 1.4

38. 2) Fifty-three hundredths or 0.53

39. 3) One and three hundredths or 1.03

40. 4) One and Two tenths or 1.2

41. 5) One and thirty-four thousandths or 1. 034

42. 6) Five thousandths or 0.005

43. 7) One and thirteen thousandths or 1.013

44. 8) Two and one hundred forty-two thousandths or 2.142

45. 9) Twenty-two thousandths or 0.022

46. 10) One and five hundredths or 1.05

47. Mental Math # 14 1)3.25 or 3.5 2)2.000 or 2.001 3)0.98 or 0.89 = 4)98.9 or 98.19 5)10.01 or 10.010 = 6)6.6 or 6.60 7)Two hundredths or two thousandths = 8)1.9 or 0.999 9)1 or 0.95 = 10) 636 or 663 =

48. Mental Math # 14 1)3.25 or 3.5 2)2.000 or 2.001 3)0.98 or 0.89 4)98.9 or 98.19 5)10.01 or 10.010 6)6.6 or 6.60 7)Two hundredths or two thousandths 8)1.9 or 0.999 9)1 or 0.95 10) 636 or 663

49. Mental Math # 15 1)3.25 rounded to the nearest tenth = 2)234.9 rounded to the nearest whole number = 3)1.984 rounded to the nearest hundredth = 4)48.9 rounded to the nearest ten = 5)10.08 rounded to the nearest tenth = 6)6.6 rounded to the nearest whole number = 7)1465.9 rounded to the nearest hundred = 8)7.3 rounded to the nearest whole number = 9)0.6544 rounded to the nearest thousandths = 10)1.95 rounded to the nearest tenth =

50. Mental Math # 15 1)3.25 rounded to the nearest tenth = 3.3 2)234.9 rounded to the nearest whole number = 235 3)1.984 rounded to the nearest hundredth = 1.98 4)48.9 rounded to the nearest ten = 50 5)10.08 rounded to the nearest tenth = 10.1 6)6.6 rounded to the nearest whole number = 7 7)1465.9 rounded to the nearest hundred = 1500 8)7.3 rounded to the nearest whole number = 7 9)0.6544 rounded to the nearest thousandths = 0.654 10)1.95 rounded to the nearest tenth = 2

51. Mental Math # 16 1)10 x 30 = 2)3 x 500 = 3)2.4 x 2 = 4)5 x 80 = 5)100 x 38 = 6)6.2 x 2 = 7)90 x 50 = 8)300 x 20 = 9)10 x 96 = 10) 1.25 x 3 =

52. Mental Math # 16 1)10 x 30 = 300 2)3 x 500 = 1500 3)2.4 x 2 = 4.8 4)5 x 80 = 400 5)100 x 38 = 3800 6)6.2 x 2 = 12.4 7)90 x 50 = 4500 8)300 x 20 = 6000 9)10 x 96 = 960 10) 1.25 x 3 = 3.75

53. Mental Math # 17 1)100 x 93 = 2)30 x 70 = 3)0.9 x 2 = 4)50 x 60 = 5)1 x 3.8 = 6)10 x 3.8 = 7)200 x 50 = 8)30 x 40 = 9)10 x 180 = 10) 1.99 x 2 =

54. Mental Math # 17 1)100 x 93 = 9300 2)30 x 70 = 2100 3)0.9 x 2 = 1.8 4)50 x 60 = 3000 5)1 x 3.8 = 3.8 6)10 x 3.8 = 38 7)200 x 50 = 10 000 8)30 x 40 = 1200 9)10 x 180 = 1800 10) 1.99 x 2 = 3.98

55. Mental Math # 18 1)30 x 90 = 2)5 x $9.13 = 3)3 x $7.97 = 4)7 x $2.06 = 5)$5.13 x 6 = 6)5 x $3.89 = 7)10 x 3.8 = 8)300 x 50 = 9)10 x 340 = 10) $1.98 x 2 =

56. Mental Math # 18 1)30 x 90 = 2700 2)5 x $9.13 = $45 3)3 x $7.97 = $24 4)7 x $2.06 = $14 or 14.42 5)$5.13 x 6 = $30 6)5 x 3.89 = $20 7)10 x 3.8 = $38 8)300 x 50 = 15 000 9)10 x 340 = 3400 10) $1.98 x 2 = $3.96 or $4.00

57. Mental Math # 19 1)20 x 700 = 2)9 x $4.21 = 3)9 x $0.97 = 4)5 x $3.36 = 5)$5.13 x 6 = 6)5 x 3.09 = 7)1 x 5.9 = 8)10 x 5.9 = 9)100 x 66 = 10) $1.05 x 3 =

58. Mental Math # 19 1)20 x 700 = 14 000 2)9 x $4.21 = $36 3)9 x $0.97 = $9 4)5 x $3.36 = $15 5)$5.13 x 6 = $30 6)5 x 3.09 = $15 or 15.45 7)1 x 5.9 = 5.9 8)10 x 5.9 = 59 9)100 x 66 = 6600 10) $1.05 x 3 = $3.15 or $3.00

59. Mental Math # 20 1)10 x 7.5 = 2)0.9 x 10 = 3)100 x 0.97 = 4)10 x 3.36 = 5)5.13 x 100 = 6)100 x 30.9 = 7)10 x 0.018 = 8)1000 x 5.9 = 9)6.6  10 = 10) 1.05 x 10 =

60. Mental Math # 20 1)10 x 7.5 = 75 2)0.9 x 10 = 9 3)100 x 0.97 = 97 4)10 x 3.36 = 33.6 5)5.13 x 100 = 513 6)100 x 30.9 = 3090 7)10 x 0.018 = 0.18 8)1000 x 5.9 = 5900 9)6.6  10 = 0.66 10) 1.05 x 10 = 10.5

61. Mental Math # 21 1)100 x 39.1 = 2)9.3 x 10 = 3)10 x 0.93 = 4)100 x 6.3 = 5)3.4  10 = 6)5.13 x 10 = 7)10 x 30.9 = 8)10 x 0.001 = 9)1000 x 0.5 = 10)10.5  100 =

62. Mental Math # 21 1)100 x 39.1 = 3910 2)9.3 x 10 = 93 3)10 x 0.93 = 9.3 4)100 x 6.3 = 630 5)3.4  10 = 0.34 6)5.13 x 10 = 51.3 7)10 x 30.9 = 309 8)10 x 0.001 = 0.01 9)1000 x 0.5 = 500 10)10.5  100 = 0.105

63. Mental Math # 22 1)45.1  10 = 2)9.3  10 = 3)67  10 = 4)6.3  100 = 5)3400  100 = 6)51.3  10 = 7)10 x 39.1 = 8)413.1  100 = 9)2.5  1000 = 10)750.5  100 =

64. Mental Math # 22 1)45.1  10 = 4.51 2)9.3  10 = 0.93 3)67  10 = 6.7 4)6.3  100 = 0.063 5)3400  100 = 34 6)51.3  10 = 5.13 7)10 x 39.1 = 391 8)413.1  100 =4.131 9)2.5  1000 = 0.0025 10)750.5  100 = 7.505

65. Mental Math # 23 1)83  100 = 2)4.7 x 10 = 3)69.2  10 = 4)16.3  100 = 5)30.4  10 = 6)933  10 = 7)10 x 92.1 = 8)4  1000 = 9)2.5  100 = 10)5.2  10 =

66. Mental Math # 23 1)83  100 = 0.83 2)4.7 x 10 = 47 3)69.2  10 = 6.92 4)16.3  100 = 0.163 5)30.4  10 = 3.04 6)933  10 = 93.3 7)10 x 92.1 = 921 8)4  1000 =0.004 9)2.5  100 = 0.025 10)5.2  10 = 0.52

67. Mental Math # 24 1)7.7  100 = 2)40 x 300 = 3)500 + 30 + 6000 + 2 = 4)6 + 8 = 5)156 + 8 = 6)200 + 400 + 53 = 7)3 x 10 + 6 x 1000 + 2 x 1 = 8)46.45 rounded to the nearest tenth = 9)Five hundred and four thousandths = 10)Which is larger 98.9 or 98.199 =

68. Mental Math # 24 1)7.7  100 = 0.077 2)40 x 300 = 12 000 3)500 + 30 + 6000 + 2 = 6532 4)6 + 8 = 14 5)156 + 8 = 164 6)200 + 400 + 53 = 653 7)3 x 10 + 6 x 1000 + 2 x 1 = 6032 8)46.45 rounded to the nearest tenth = 46.5 9)Five hundred and four thousandths = 500.004 10)Which is larger 98.9 or 98.199 = 98.9

69. Mental Math # 25 1)822.4  100 = 2)50 x 30 = 3)5 + 800 + 60 + 2000 = 4)7 + 5 = 5)335 + 7 = 6)2 x $3.99= 7)3 x 100 + 6 x 10 + 2 x 1000 = 8)8.4488 rounded to the nearest hundredth = 9)ten and thirteen thousandths = 10) =

70. Mental Math # 25 1)822.4  100 = 8.224 2)50 x 30 = 1500 3)5 + 800 + 60 + 2000 = 2865 4)7 + 5 = 12 5)335 + 7 = 342 6)2 x $3.99= $7.98 7)3 x 100 + 6 x 10 + 2 x 1000 = 2360 8)8.4488 rounded to the nearest hundredth = 8.45 9)ten and thirteen thousandths = 10.013 10) = 1.04

71. Mental Math # 26 1.105 cm = ____ m 2.2 L = _____ mL 3.5000 m = _____ km 4.3.4 mm = _____ cm 5.90 mL = _____ L 6.600 g = _____ kg 7.1 mg = _____ g 8.3 km = _____ m 9.0.01 g = _____ mg 10. 20 m = _____ cm

72. Mental Math # 26 1.105 cm = 1.05 m 2.2 L = 2000 mL 3.5000 m = 5 km 4.3.4 mm = 0.34 cm 5.90 mL = 0.09 L 6.600 g = 0.6 kg 7.1 mg = 0.001 g 8.3 km = 3000 m 9.0.01 g = 10 mg 10. 20 m = 2000 cm

73. Mental Math # 27 1.6 L = _____ mL 2.3700 m = _____km and _____m 3.59 km = _____ m 4.3.4 cm = _____mm 5.345 mL = _____L 6.69 mg = _____ g 7.1112 g = _____kg 8.9 km = _____ m 9.0.08 g = _____ mg 10. 2160 m = _____ km and _____m

74. Mental Math # 27 1.6 L = 6000 mL 2.3700 m = 3 km and 700 m 3.59 km = 59 000 m 4.3.4 cm = 34 mm 5.345 mL = 0.345 L 6.69 mg = 0.069 g 7.1112 g = 1.112 kg 8.9 km = 9000 m 9.0.08 g = 80 mg 10. 2160 m = 2 km and 160 m

75. Mental Math # 28 1.3900 mm = _____ m 2.4321 m = _____ km and _____ m 3.5900 mL = _____ L and _____ mL 4.47 cm = _____ mm 5.805 mL = _____ L 6.6 g = _____ mg 7.4 kg = _____ g 8.9 km = _____ hm 9.8 g = _____ dg 10. 2002 m = _____ km and _____ m

76. Mental Math # 28 1.3900 mm = 3.9 m 2.4321 m = 4 km and 321 m 3.5900 mL = 5 L and 900 mL 4.47 cm = 470 mm 5.805 mL = 0.805 L 6.6 g = 6000 mg 7.4 kg = 4000 g 8.9 km = 90 hm 9.8 g = 80 dg 10. 2002 m = 2 km and 2 m

77. Mental Math Practice # 1 1.Have $10, spend $1.25 = 2.Have $10, spend $3.45 = 3.Have $5, spend $2.30 = 4.Have $20, spend $10.02 = 5.Have $5, spend $2.89 = 6.Have $20, spend $14.37 = 7.Have $20, spend $18.50 = 8.Have $10, spend $3.90 = 9.Have $5, spend $0.78 = 10.Have $10, spend $8.10 =

78. Mental Math Practice # 1 1.Have$10, spend $1.25 = $8.75 2.Have $10, spend $3.45 =$6.55 3.Have $5, spend $2.30 = $2.70 4.Have $20, spend $10.02 = $9.98 5.Have $5, spend $2.89 = $2.11 6.Have $20, spend $14.37 = $5.63 7.Have $20, spend $18.50 = $1.50 8.Have $10, spend $3.90 = $6.10 9.Have $5, spend $0.78 = $4.22 10.Have $10, spend $8.10 = $1.90

79. Mental Math Practice # 2 1.Have $10, spend $2.75 = 2.Have $10, spend $3.55 = 3.Have $5, spend $3.90 = 4.Have $20, spend $11.97 = 5.Have $5, spend $2.75 = 6.Have $20, spend $15.43 = 7.Have $20, spend $16.50 = 8.Have $10, spend $1.70 = 9.Have $5, spend $0.63 = 10.Have $10, spend $7.20 =

80. Mental Math Practice # 2 1.Have $10, spend $2.75 = $7.25 2.Have $10, spend $3.55 = $6.45 3.Have $5, spend $3.90 = $1.10 4.Have $20, spend $11.97 = $8.03 5.Have $5, spend $2.75 = $2.25 6.Have $20, spend $15.43 = $4.57 7.Have $20, spend $16.50 = $3.50 8.Have $10, spend $1.70 = $8.30 9.Have $5, spend $0.63 = $4.37 10.Have $10, spend $7.20 = $2.80

81. Mental Math # 29 1.Have $10, spend $2.80 = 2.Have $10, spend $5.35 = 3.Have $5, spend $1.40 = 4.Have $20, spend $13.87 = 5.Have $5, spend $2.75 = 6.Have $20, spend $15.33 = 7.Have $20, spend $17.50 = 8.Have $10, spend $4.45 = 9.Have $5, spend $0.71 = 10.Have $10, spend $8.20 =

82. Mental Math # 29 1.Have $10, spend $2.80 = $7.20 2.Have $10, spend $5.35 = $4.65 3.Have $5, spend $1.40 = $3.60 4.Have $20, spend $13.87 = $6.13 5.Have $5, spend $2.75 = $2.25 6.Have $20, spend $15.33 = $4.67 7.Have $20, spend $17.50 = $2.50 8.Have $10, spend $4.45 = $5.55 9.Have $5, spend $0.71 = $4.29 10.Have $10, spend $8.20 = $1.80

83. Mental Math # 30 1.Have $10, spend $3.35 = 2.Have $10, spend $7.40 = 3.Have $5, spend $0.84 = 4.Have $20, spend $18.99 = 5.Have $5, spend $2.25 = 6.Have $20, spend $16.29 = 7.Have $20, spend $18.50 = 8.Have $10, spend $4.95 = 9.Have $5, spend $0.30 = 10.Have $10, spend $6.70 =

84. Mental Math # 30 1.Have $10, spend $3.35 = $6.65 2.Have $10, spend $7.40 = $2.60 3.Have $5, spend $0.84 = $4.16 4.Have $20, spend $18.99 = $1.01 5.Have $5, spend $2.25 = $2.75 6.Have $20, spend $16.29 = $3.71 7.Have $20, spend $18.50 = $1.50 8.Have $10, spend $4.95 = $5.05 9.Have $5, spend $0.30 = $4.70 10.Have $10, spend $6.70 = $3.30

85. Mental Math # 31 1.Have $10, spend $8.30 = 2.Have $10, spend $1.41 = 3.Have $5, spend $0.34 = 4.$3.99 + ? = $10.00 5.5.2 + ? = 10 6.Have $20, spend $11.50 = 7.Have $20, spend $7.68 = 8.0.74 + ? = 5 9.? + 4.085 = 5 10.17.10 + ? = 20

86. Mental Math # 31 1.Have $10, spend $8.30 = $1.70 2.Have $10, spend $1.41 = $8.59 3.Have $5, spend $0.34 = $4.66 4.$3.99 + $6.01 = $10.00 5.5.2 + 4.8 = 10 6.Have $20, spend $11.50 = $8.50 7.Have $20, spend $7.68 = $12.32 8.0.74 + 4.26 = 5 9.0.915 + 4.085 = 5 10.17.1 + 2.9 = 20

87. Mental Math # 32 1.Have $10, spend $5.15 = 2.Have $10, spend $3.57 = 3.Have $5, spend $1.92 = 4.$4.61 + ? = $10.00 5.3.7 + ? = 10 6.Have $20, spend $12.75 = 7.Have $20, spend $9.50 = 8.0.31 + ? = 1 9.? + 2.425 = 5 10.15.5 + ? = 20

88. Mental Math # 32 1.Have $10, spend $5.15 = $4.85 2.Have $10, spend $3.57 = $6.43 3.Have $5, spend $1.92 = $3.08 4.$4.61 + $5.39 = $10.00 5.3.7 + 6.3 = 10 6.Have $20, spend $12.75 = $7.25 7.Have $20, spend $9.50 = $10.50 8.0.31 + 0.69 = 1 9.2.575 + 2.425 = 5 10.15.5 + 4.5 = 20

89. Mental Math # 33 1.20 + 14 = 2.55 + 43 = 3.38 + 26 = 4.65 + 27 = 5.78 + 135 = 6.23 + 59 = 7.48 + 24 = 8.45 + 48 = 9.36 + 47 = 10.263 + 43 =

90. Mental Math # 33 1.20 + 14 = 34 2.55 + 43 = 98 3.38 + 26 = 64 4.65 + 27 = 92 5.78 + 135 = 213 6.23 + 59 = 82 7.48 + 24 = 72 8.45 + 48 = 93 9.36 + 47 = 83 10.263 + 43 = 306

91. Mental Math # 34 1.46 + 27 = 2.35 + 48 = 3.18 + 73 = 4.94 + 26 = 5.82 + 225 = 6.77 + 19 = 7.49 + 49 = 8.23 + 45 = 9.32 + 41 + 60 = 10.227 + 63 =

92. Mental Math # 34 1.46 + 27 = 73 2.35 + 48 = 83 3.18 + 73 = 91 4.94 + 26 = 120 5.82 + 225 = 307 6.77 + 19 = 96 7.49 + 49 = 98 8.23 + 45 = 68 9.32 + 41 + 60 = 133 10.227 + 63 = 290

93. Mental Math # 35 1.30 + 25 + 70 = 2.35 + 40 + 60 + 20 = 3.50 + 95 + 50 = 4.10 + 75 + 50 + 50 + 25 = 5.90 + 25 + 75 + 10 = 6.85 + 25 + 25 + 15 = 7.20 + 80 + 55 + 30 + 45 = 8.35 + 20 + 90 + 65 = 9.20 + 40 + 60 + 180 = 10.300 + 700 + 600 =

94. Mental Math # 35 1.30 + 25 + 70 = 125 2.35 + 40 + 60 + 20 = 155 3.50 + 95 + 50 = 195 4.10 + 75 + 50 + 50 + 25 = 210 5.90 + 25 + 75 + 10 = 200 6.85 + 25 + 25 + 15 = 150 7.20 + 80 + 55 + 30 + 45 = 230 8.35 + 20 + 90 + 65 = 210 9.20 + 40 + 60 + 180 = 300 10.300 + 700 + 600 = 1600

95. Mental Math # 36 1.50 + 25 + 75 = 2.35 + 70 + 30 + 65 + 10= 3.20 + 50 + 150 = 4.70 + 10 + 30 + 60 + 40 = 5.90 + 55 + 45 + 10 + 80 = 6.25 + 25 + 25 + 50 = 7.20 + 80 + 55 + 30 + 45 = 8.100 + 200 + 900 + 65 = 9.200 + 50 + 130 + 50 = 10.200 + 70 + 800 + 30 =

96. Mental Math # 36 1.50 + 25 + 75 = 150 2.35 + 70 + 30 + 65 + 10= 210 3.20 + 50 + 150 = 220 4.70 + 10 + 30 + 60 + 40 = 210 5.90 + 55 + 45 + 10 + 80 = 280 6.25 + 25 + 25 + 50 = 125 7.20 + 80 + 55 + 30 + 45 = 230 8.100 + 200 + 900 + 65 = 1265 9.200 + 50 + 130 + 50 = 430 10.200 + 70 + 800 + 30 = 1100

97. Mental Math # 37 1.29 + 75 = 2.56 + 52= 3.25 + 54 = 4.175 + 24 = 5.90 + 55 = 6.26 + 99 = 7.98 + 79 = 8.125 + 77 = 9.258 + 50 = 10.215 + 90 =

98. Mental Math # 37 1.29 + 75 = 104 2.56 + 52= 108 3.25 + 54 = 79 4.175 + 24 = 199 5.90 + 55 = 145 6.26 + 99 = 125 7.98 + 79 = 177 8.125 + 77 = 202 9.258 + 50 = 308 10.215 + 90 = 305

99. Mental Math # 38 1.28 + 75 = 2.225 + 76 = 3.25 + 98 = 4.198 + 28 = 5.390 + 38 = 6.87 + 198 = 7.99 + 209 = 8.175 + 27 = 9.325 + 79 = 10.50 + 158 =

100. Mental Math # 38 1.28 + 75 = 103 2.225 + 76 = 301 3.25 + 98 = 123 4.198 + 28 = 226 5.390 + 38 = 428 6.87 + 198 = 285 7.99 + 209 = 308 8.175 + 27 = 202 9.325 + 79 = 404 10.50 + 158 = 208

101. Mental Math # 39 1.228  2 = 2.255  5 = 3.339  3 = 4.168  4 = 5.300  50 = 6.726  6 = 7.990  90 = 8.200  5 = 9.714  7 = 10.342  3 =

102. Mental Math # 39 1.228  2 = 114 2.255  5 = 51 3.339  3 = 113 4.168  4 = 42 5.300  50 = 6 6.726  6 = 121 7.990  90 = 11 8.200  5 = 40 9.714  7 = 102 10.342  3 = 114

103. Mental Math # 40 1.530  5 = 2.369  3 = 3.322  2 = 4.464  4 = 5.600  30 = 6.816  8 = 7.8000  40 = 8.260  5 = 9.147  7 = 10.189  9 =

104. Mental Math # 40 1.530  5 = 106 2.369  3 = 123 3.322  2 = 161 4.464  4 = 116 5.600  30 = 20 6.816  8 = 102 7.8000  40 = 200 8.260  5 = 52 9.147  7 = 21 10.189  9 = 21

106. Mental Math # 1 1)125 + 35 = 2)2000 + 50 + 400 + 4 = 3)4.2 + 3 + 0.8 = 4)2 3 = 5)$10.00 - $3.85 = 6)65 + ? = 100 7)90 x 50 = 8)135  5 = 9)100 x 0.15 = 10) 6 0 =

107. Mental Math # 1 1)125 + 35 = 160 2)2000 + 50 + 400 + 4 = 2454 3)4.2 + 3 + 0.8 = 8 4)2 3 = 8 5)$10.00 - $3.85 = $6.15 6)65 + 35 = 100 7)90 x 50 = 4500 8)135  5 = 27 9)100 x 0.15 = 15 10) 6 0 = 1

108. Mental Math # 2 1)375 + 45 = 2)200 + 60 + 140 = 3)3 1 = 4)2.7 + 3 + 1.3 = 5)You give $5 for a purchase costing $2.55. What is your change? 6)? + 275 = 1000 7)2800 in scientific notation is = 8)284  2 = 9)2.9 x 100 = 10) 37  10 =

109. Mental Math # 2 1)375 + 45 = 420 2)200 + 60 + 140 = 400 3) 3 1 = 3 4)2.7 + 3 + 1.3 = 7 5)You give $5 for a purchase costing $2.55. What is your change? $2.45 6)725 + 275 = 1000 7) 2800 in scientific notation is = 2.8 x 10 3 8)284  2 = 142 9)2.9 x 100 = 290 10) 38.9  10 = 3.89

110. Mental Math # 3 1)530 + 28 = 2)2100 + 500 + 230 = 3)3.5 + 3 + 1.5 = 4)234.5 in scientific notation = 5)You give $5 for a purchase costing $3.30. What is your change? 6)300 + 300 + ? = 1000 7)40 x 500 = 8)396  3 = 9)5.3 m equals ___ cm = 10) 82.9  10 =

111. Mental Math # 3 1)530 + 28 = 558 2)2100 + 500 + 230 = 2830 3)3.5 + 3 + 1.5 = 8 4)234.5 in scientific notation = 2.345 x 10 2 5)You give $5 for a purchase costing $3.30. What is your change? $1.70 6)300 + 300 + 400 = 1000 7)40 x 500 = 20 000 8)396  3 = 132 9)5.3 m equals 530 cm 10) 82.9  10 = 8.29

112. Mental Math # 4 1)200 + 6000 + 3 + 70 = 2)50 + 3100 + 700 = 3)3 2 = 4)9 + 40.3 + 0.5 = 5)$10.00 - $6.75 = 6)35 + 25 + ? = 100 7)3000 x 20 = 8)350  5 = 9)237  100 = 10)What does this represent?

113. Mental Math # 4 1)200 + 6000 + 3 + 70 = 6273 2)50 + 3100 + 700 = 3850 3)3 2 = 9 4)9 + 40.3 + 0.5 = 49.8 5)$10.00 - $6.75 = $3.25 6)35 + 25 + 40 = 100 7)3000 x 20 = 60 000 8)350  5 = 70 9)237  100 = 2.37 10)2.304

114. Mental Math # 5 1)285 + 65 = 2)4000 + 7 + 500 + 30 = 3)6.3 + 0.4 + 1.7 = 4)3 3 = 5)$20.00 - $11.95 = 6)? + 55 = 200 7)3 x 700 = 8)1000  50 = 9)100 x 0.65 = 10) 636  3

115. Mental Math # 5 1)285 + 65 = 350 2)4000 + 7 + 500 + 30 = 4537 3)6.3 + 0.4 + 1.7 = 8.4 4) 3 3 = 27 5)$20.00 - $11.95 = $8.05 6)145 + 55 = 200 7)3 x 700 = 2100 8)1000  50 = 20 9)100 x 0.65 = 65 10) 636  3 = 212

116. Mental Math # 6 1)75 + 380 = 2)3 0 = 3)4.3 + 3.2 + 1.8 = 4)1000 - 540 = 5)$100.00 - $59.00 = 6)? + 85 = 200 7)200 x 40 = 8)1000  20 = 9)100 x 4.5 = 10) 842  2

117. Mental Math # 6 1)75 + 380 = 455 2)3 0 = 1 3)4.3 + 3.2 + 1.8 = 9.3 4)1000 - 540 = 460 5)$100.00 - $59.00 = $41.00 6)115 + 85 = 200 7)200 x 40 = 8000 8)1000  20 = 50 9)100 x 4.5 = 450 10) 842  2 = 421

118. Mental Math # 7 1)125 + 35 + 75 = 2)2 4 = 3)4.5 + 3.5 + 0.8 = 4)35 0 = 5)$10.00 - $3.80 = 6)65 + ? = 300 7)90 x 30 = 8)15cm equals __dm = 9)1000 x 0.15 = 10) 560  5 =

119. Mental Math # 7 1)125 + 35 + 75 = 235 2)2 4 = 16 3)4.5 + 3.5 + 0.8 = 8.8 4)35 0 = 1 5)$10.00 - $3.80 = $6.20 6)65 + 235 = 300 7)90 x 30 = 2700 8)15cm equals 1.5 dm 9)1000 x 0.15 = 150 10) 560  5 = 112

120. Mental Math # 8 1)250 + 125 = 2)8m equals ___dm 3)2.3 + 5.8 + 1.7 = 4)5 1 = 5)$20.00 - $6.99 = 6)95 + ? = 300 7)500 x 70 = 8)550  5 = 9)10 x 1.33 = 10) 361.1  100 =

121. Mental Math # 8 1)250 + 125 = 375 2) 8m equals 80 dm = 3)2.3 + 5.8 + 1.7 = 9.8 4) 5 1 = 5 5)$20.00 - $6.99 = $13.01 6)95 + 205 = 300 7)500 x 70 = 35 000 8)550  5 = 110 9)10 x 1.33 = 13.3 10) 361.1  100 = 3.611

122. Mental Math # 9 1)8 410 000 in scientific notation = 2)8 0 = 3)$5.50 + $10 + 2.30 = 4)10.3 + 4.6 + 0.4 = 5)$10.00 - $2.10 = 6)350 + 500 + ? = 1000 7)600 x 3 = 8)446  4 = 9)2.11 x 1000 = 10) 762.2  100 =

123. Mental Math # 9 1)8 410 000 in scientific notation = 8.41 x 10 6 2)8 0 = 1 3)$5.50 + $10 + 2.30 = $17.80 4)10.3 + 4.6 + 0.4 = 15.3 5)$10.00 - $2.10 = $7.90 6)350 + 500 + 150 = 1000 7)600 x 3 = 1800 8)446  4 = 111 R2 9)2.11 x 1000 = 2110 10) 762.2  100 = 7.622

124. Mental Math # 10 1) 355.5 in scientific notation = 2)90 km equals ____ m 3)4.1 + 3.6 + 1.9 = 4)1000 – 230 = 5)$20.00 - $9.90 = 6)180 + ? = 500 7)500 x 20 = 8)559  5 = 9)10 x 27.3 = 10) 590.1  100 =

125. Mental Math # 10 1)355.5 in scientific notation = 3.555 x 10 2 2)90km equals 90 000m 3)4.1 + 3.6 + 1.9 = 9.6 4)1000 – 230 = 770 5)$20.00 - $9.90 = $10.10 6)180 + 320 = 500 7)500 x 20 = 10 000 8)559  5 = 111 R4 9)10 x 27.3 = 273 10) 590.1  100 = 5.901

126. Mental Math # 11 1)If = 1, then = 2)530 000 in scientific notation = 3)7.95m equals ____cm 4)4.3 + 2.5 + 1.7 = 5)1000 – 440 = 6)You give $10.00 for a purchase costing $6.92. What is your change? 7)? + 275 + 25 = 1000 8)672  6 = 9)769.1  10 = 10)3.4 x 10 2 =

127. Mental Math # 11 1)If = 1, then = 12.3 2)530 000 in scientific notation = 5.3 x 10 5 3)7.95m equals 795cm 4)4.3 + 2.5 + 1.7 = 8.5 5)1000 – 440 = 560 6)You give $10.00 for a purchase costing $6.92. What is your change? $3.08 7)700 + 275 + 25 = 1000 8)672  6 = 112 9)769.1  10 = 76.91 10)3.4 x 10 2 = 340

128. Mental Math # 12 1)If = 1, then = 2)385 000 = 3)5.1 + 5.1 + 7.3 = 4)9 + 40.3 + 0.5 = 5)$10.00 - $6.75 = 6)35 + 25 + ? = 100 7)3000 x 20 = 8)350  5 = 9)4.2 x 1000 = 10) 237  10 =

129. Mental Math # 12 1)If =1, then= 2.3 2)385 000 = 3.85 x 10 5 3)5.1 + 5.1 + 7.3 = 17.5 4)9 + 40.3 + 0.5 = 49.8 5)$10.00 - $6.75 = $3.25 6)35 + 25 + 40 = 100 7)3000 x 20 = 60 000 8)350  5 = 70 9)4.2 x 1000 = 4200 10) 237  10 = 23.7

130. Mental Math # 13 1)Two squared added to three squared = 2)2L equals ___ mL = 3)1.5 + 1.5 + 1.5 + 1.6 = 4)3100 + 200 + 540 = 5)You give $5 for a purchase costing $2.55. What is your change? 6)? + 275 = 1000 7)200 x 80 = 8)384  2 = 9)2.9 x 100 = 10) 37  10 =

131. Mental Math # 13 1)Two squared added to three squared = 13 2) 2L equals 2000 mL = 3)The difference of 5 2 and 2 2 = 4)3100 + 200 + 540 = 3840 5)You give $5 for a purchase costing $2.55. What is your change? $2.45 6)725 + 275 = 1000 7)200 x 80 = 16 000 8)384  2 = 192 9)2.9 x 100 = 290 10) 37  10 = 3.7

132. Mental Math # 14 1)53 dam = ____ m 2)2 x 10 3 = 3)The difference of 5 2 and 2 2 = 4)2 + 5.1 + 1.8 = 5)You give $5 for a purchase costing $3.30. What is your change? 6)300 + 199 + ? = 1000 7)40 x 500 = 8)396  3 = 9)5.3 x 100 = 10)82  10 =

133. Mental Math # 14 1)53 dam = 530 m 2)2 x 10 3 = 2000 3)The difference of 5 2 and 2 2 = 21 4)2 + 5.1 + 1.8 = 8.9 5)You give $5 for a purchase costing $3.30. What is your change? $1.70 6)300 + 199 + 501 = 1000 7)40 x 500 = 20 000 8)396  3 = 132 9)5.3 x 100 = 530 10) 82  10 = 8.2

134. Mental Math # 15 1)210 + 163 = 2)5000 + 660 + 1000 = 3)5.5 + 5.5 + 5.5 = 4)2.9 + 4.4 + 0.6 = 5)You give $10 for a purchase costing $5.99. What is your change? 6)250 + 400 + ? = 1000 7)50 x 60 = 8)784  7 = 9)47.3 x 10 = 10)2444  100

135. Mental Math # 15 1)210 + 163 = 373 2)5000 + 660 + 1000 = 6660 3)5.5 + 5.5 + 5.5 = 16.5 4)2.9 + 4.4 + 0.6 = 7.9 5)You give $10 for a purchase costing $5.99. What is your change? $4.01 6)250 + 400 + 350 = 1000 7)50 x 60 = 3000 8)784  7 = 112 9)47.3 x 10 = 473 10)2444  100 = 24.44

136. Mental Math # 16 1)3200 + 543 = 2)30 + 7000 + 420 = 3)10 + 5.8 + 3.2 = 4)8.9 – 4.8 = 5)You give $20 for a purchase costing $1.90 What is your change? 6)750 + 200 + ? = 1000 7)90 x 20 = 8)575  5 = 9)0.633 x 100 = 10)71.4  10

137. Mental Math # 16 1)3200 + 543 = 3743 2)30 + 7000 + 420 = 7450 3)10 + 5.8 + 3.2 = 19 4)8.9 – 4.8 = 4.1 5)You give $20 for a purchase costing $1.90 What is your change? $18.10 6)750 + 200 + 50 = 1000 7)90 x 20 = 1800 8)575  5 = 115 9)0.633 x 100 = 63.3 10)71.4  10 = 7.14

138. Mental Math # 17 1)6700 + 208 = 2)3000 + 700 + 220 = 3)10.3 + 5.7 + 4.2 = 4)10.9 – 3.5 = 5)You give $20 for a purchase costing $4.30 What is your change? 6)550 + 150 + ? = 1000 7)The sum of two cubed and two squared = 8)726  6 = 9)11.5 x 100 = 10)51.37  10 =

139. Mental Math # 17 1)6700 + 208 = 6908 2)3000 + 700 + 220 = 3920 3)10.3 + 5.7 + 4.2 =20.2 4)10.9 – 3.5 = 7.4 5)You give $20 for a purchase costing $4.30 What is your change? $15.70 6)550 + 150 + 300 = 1000 7)The sum of two cubed and two squared = 12 8)726  6 = 121 9)11.5 x 100 = 1150 10)51.37  10 = 5.137

140. Mental Math # 18 1)Which is larger –4 or -7 = 2)3 + -5 = 3)100.5 + 20.1 = 4)8.4 – 3.1 = 5)You give $100 for a purchase costing $65.00 What is your change? 6)70 + 500 + ? = 1000 7)3100 x 10 = 8)805  5 = 9)5.3 x 100 = 10)1.3  10 =

141. Mental Math # 18 1)Which is larger –4 or -7 = -4 2)3 + -5 = -2 3)100.5 + 20.1 = 120.6 4)8.4 – 3.1 = 5.3 5)You give $100 for a purchase costing $65.00 What is your change? $35.00 6)70 + 500 + 430 = 1000 7)3100 x 10 = 31 000 8)805  5 = 161 9)5.3 x 100 = 530 10)1.3  10 = 0.13

142. Mental Math # 19 1)(-5) + (-3) = 2)(+8) + (-2) = 3)(-2) + (-4) = 4)(-5) + (+10) 5)You owe you friend $20. You earn $15 babysitting. What is your net worth? 6)(50) - (-10) = 7) (-5) + (+3) = 8)-2 - -6 = 9)575  5 = 10) -2 - +10 =

143. Mental Math # 19 1)(-5) + (-3) = -8 2)(+8) + (-2) = +6 3)(-2) + (-4) = -6 4)(-5) + (+10)= +5 5)You owe you friend $20. You earn $15 babysitting. What is your net worth? $-5 6)(50) - (-10) = 60 7) (-5) + (+3) = -2 8)-2 - -6 = +4 9)575  5 = 115 10) -2 - +10 = -12

144. Mental Math # 20 1)(-6) + (-3) = 2)(8) + (-2) = 3)(-2) - (-4) = 4)(5) x (-10) = 5)You owe you friend $20. You earn $8. What is your net worth? 6)(50) - (-10) = 7) (-5) + (+3) = 8)-20 x -60 = 9)555  -5 = 10) 2 groups of -10 =

145. Mental Math # 20 1)(-6) + (-3) = -9 2)(8) + (-2) = 6 3)(-2) - (-4) = +2 4)(5) x (-10) -50 5)You owe you friend $20. You earn $8. What is your net worth? $-12 6)(50) - (-10) = 60 7) (-5) + (+3) = -2 8)-20 x -60 = 1200 9)555  -5 = -111 10) 2 groups of -10 = -20

146. Mental Math # 21 1)(-2) + (+7) = 2)(-8) - (-5) = 3)(-5) - (-10) = 4)(-6) x (-5) = 5)You have $50. You earn $20 babysitting. You purchase two tickets for a concert costing $10 each. What is your net worth? 6)Negative 10 squared = 7) (+5) + (-3) = 8)500 x -7 = 9)-448  -2 = 10) Yesterday we earn $230 selling cotton candy. Last night we earned $150. Our expenses so far is $20. What is our net profit. =

147. Mental Math # 21 1)(-2) + (+7) = +5 2)(-8) - (-5) = -3 3)(-5) - (-10) = +5 4)(-6) x (-5) = 30 5)You have $50. You earn $20 babysitting. You purchase two tickets for a concert costing $10 each. What is your net worth? $50 6)Negative 10 squared = 100 7) (+5) + (-3) = +2 8)500 x -7 = -3500 9)-448  -2 = 224 10) Yesterday we earn $230 selling cotton candy. Last night we earned $150. Our expenses so far is $20. What is our net profit. = $360

148. Mental Math # 22 1)(-12) - (+3) = 2)(-2) - (-5) = 3)(-5) (-10) = 4)4 + -5 = 5)You owe $60. You earn $5 an hour babysitting. You baby- sit for 5 hours. What is your net worth? 6)-2 3 = 7) (+5). (-3) = 8)-10 x –10 x –10 x -10 = 9)-4 + ? = -1 10) -60 = 3

149. Mental Math # 22 1)(-12) - (+3) = -15 2)(-2) - (-5) = +3 3)(-5) (-10) = +50 4)4 + -5 = -1 5)You owe $60. You earn $5 an hour babysitting. You baby-sit for 5 hours. What is your net worth? $-35 6)-2 3 = -8 7) (+5). (-3) = -15 8)-10 x –10 x –10 x -10 = 10 000 9)-4 + 3 = -1 10) -60 = -20 3

150. Mental Math # 23 1)3.1 x 10 2 = 2)(-5) + (+1) = 3)10.5 + 20.5 + 0.6 = 4) (+5) + (-4) = 5)You give $100 for a purchase costing $90.90 What is your change? 6)7 x 100 + 5 x 10 + 3 x 1 = 7)(-3) + (-2) = 8)729  3 = 9)5 2 = 10)(-3) – (-5) =

151. Mental Math # 23 1)3.1 x 10 2 = 310 2)(-5) + (+1) = -4 3)10.5 + 20.5 + 0.6 = 31.6 4)(+5) + (-4) = +1 5)You give $100 for a purchase costing $90.90 What is your change? $9.10 6)7 x 100 + 5 x 10 + 3 x 1 = 753 7)(-3) + (-2) = -5 8)729  3 = 243 9)5 2 = 25 10)(-3) – (-5) = +2

152. Mental Math # 24 1)2.3 x 10 2 = 2)3 + -2 = 3)5 0 = 4)9 + 40.3 + 0.5 = 5)$10.00 - $6.75 = 6)345 000 in scientific notation = 7)(-4) + (+4) = 8)255  5 = 9)4.2 x 1000 = 10) 2 3 =

153. Mental Math # 24 1)2.3 x 10 2 = 230 2) 3 + -2 = 1 3)5 0 = 1 4)9 + 40.3 + 0.5 = 49.8 5)$10.00 - $6.75 = $3.25 6)345 000 in scientific notation = 3.45 x 10 5 7) (-4) + (+4) = 0 8) 255  5 = 51 9)4.2 x 1000 = 4200 10) 2 3 = 8

154. Mental Math # 25 1)Double 3000 = 2)3 x 1000 + 5 x 100 = 3)7.1 + 8.8 + 1.2 = 4)You spend $5.48. You have $10.00. What is your change? 5)$100.00 + $432.90 = 6)670 + ? = 1000 7)542 x 100 = 8)Three cubed = 9)844  4 = 10) 81 groups of 10 2 =

155. Mental Math # 25 1)Double 3000 = 6000 2)3 x 1000 + 5 x 100 = 3500 3)7.1 + 8.8 + 1.2 = 17.1 4)You spend $5.48. You have $10.00. What is your change? $4.52 5)$100.00 + $432.90 = $532.90 6)670 + 330 = 1000 7)542 x 100 = 54200 8)Three cubed = 27 9)844  4 = 211 10) 81 groups of 10 2 = 8100

156. Mental Math # 26 1)Double 2000 and add 300 = 2)6 x 10 2 + 3 x 10 0 = 3)8.1 + 2.9 + 4.2 = 4)You spend $5.70 You have $10.00. What is your change? 5)Half of 400 minus 10 = 6)Multiple 9 groups of 50 = 7)62 x 100 = 8)Four squared = 9) 784  100 = 10) 3.2 x 10 3 =

157. Mental Math # 26 1)Double 2000 and add 300 = 4300 2)6 x 10 2 + 3 x 10 0 = 603 3)8.1 + 2.9 + 4.2 = 15.2 4)You spend $5.70 You have $10.00. What is your change? $4.30 5)Half of 400 minus 10 = 190 6)Multiple 9 groups of 50 = 450 7)62 x 100 = 6200 8)Four squared = 16 9) 784  100 = 7.84 10) 3.2 x 10 3 = 3200

158. Mental Math # 27 1)The complement to a 60 0 angle = 2)The complement to a 25 0 angle = 3)The supplement to a 100 0 angle = 4)The supplement to a 160 0 angle = 5)The supplement to a 50 0 angle = 6)The complement to a 72 0 angle = 7)The complement to a 55 0 angle = 8)The supplement to a 70 0 angle = 9)The supplement to a 40 0 angle = 10)The reflex angle to a 70 0 angle =

159. Mental Math # 27 1)The complement to a 60 0 angle = 30 0 2)The complement to a 25 0 angle = 65 0 3)The supplement to a 100 0 angle = 80 0 4)The supplement to a 160 0 angle = 20 0 5)The supplement to a 50 0 angle = 130 0 6)The complement to a 72 0 angle = 18 0 7)The complement to a 55 0 angle = 35 0 8)The supplement to a 70 0 angle = 110 0 9)The supplement to a 40 0 angle = 140 0 10)The reflex angle to a 70 0 angle = 290 0

160. Mental Math # 28 1)The complement to a 75 0 angle = 2)The complement to a 29 0 angle = 3)The supplement to a 152 0 angle = 4)The supplement to a 125 0 angle = 5)The opposite angle to a 50 0 angle = 6)The reflex angle to a 50 0 angle = 7)The reflex angle to a 120 0 angle = 8)The measure of angle a = 9)The measure of angle b = 10)The measure of angle c = a b c

161. Mental Math # 28 1)The complement to a 75 0 angle = 15 0 2)The complement to a 29 0 angle = 61 0 3)The supplement to a 152 0 angle = 28 0 4)The supplement to a 125 0 angle = 55 0 5)The opposite angle to a 50 0 angle = 50 0 6)The reflex angle to a 50 0 angle = 310 0 7)The reflex angle to a 120 0 angle = 240 0 8)The measure of angle a = 45 0 9)The measure of angle b = 90 0 10)The measure of angle c = 45 0 a b c

162. Mental Math # 29 1)The m < a = 2)The m < b = 3)The m < c = 4)The m < d = 5)The m < e = 6)The m < f = 7)The m < g = 8)The m < h = 9)The m < i = 10)The m < j = d a 30 o cb ef 70 o g h i j

163. Mental Math # 29 1)The m < a = 150 0 2)The m < b = 30 0 3)The m < c = 150 0 4)The m < d = 30 0 5)The m < e = 150 0 6)The m < f = 30 0 7)The m < g = 70 0 8)The m < h = 70 0 9)The m < i = 80 0 10)The m < j = 110 0 d a 30 o cb ef 70 o g h i j

164. Mental Math # 30 1)The m < a = 2)The m < b = 3)The m < c = 4)The m < d = 5)The m < e = 6)The m < f = 7)The m < g = 8)The m < h = 9)The m < i = 10)The m < j = d a 120 o c b e f 80 o g h i j

165. Mental Math # 30 1)The m < a = 60 0 2)The m < b = 120 0 3)The m < c = 60 0 4)The m < d = 100 0 5)The m < e = 100 0 6)The m < f = 80 0 7)The m < g = 80 0 8)The m < h = 40 0 9)The m < i = 40 0 10)The m < j = 140 0 d a 120 o c b e f 80 o g h i j

166. Mental Math # 31 1)3000 + 705 + 20 = 2)9000 + 20 + 70 = 3)4.1 + 3.6 + 1.9 = 4)1000 – 230 = 5)$100.00 - $9.90 = 6)180 + ? = 500 7)500 x 20 = 8)5 x 10 1 = 9)10 x 27.3 = 10) 590.1  10 2 =

167. Mental Math # 31 1)3000 + 705 + 20 = 3725 2)9000 + 20 + 70 = 9090 3)4.1 + 3.6 + 1.9 = 9.6 4)1000 – 230 = 770 5)$100.00 - $9.90 = $90.10 6)180 + 320 = 500 7)500 x 20 = 10 000 8)5 x 10 1 = 50 9)10 x 27.3 = 273 10) 590.1  10 2 = 5.901

168. Mental Math # 32 1)Double 650 = 2)6 x 1000 + 3 x 100 + 2 x 1= 3)5.3 + 2.9 + 5.7 = 4)You spend $3.25 You have $10.00. What is your change? 5)Half of 450 = 6)Multiple 40 groups of 60 = 7)6.5 x 100 = 8)Two squared added to three squared = 9)6366  3 = 10) 3 groups of 10 3 =

169. Mental Math # 32 1)Double 650 = 1300 2)6 x 1000 + 3 x 100 + 2 x 1 = 6302 3)5.3 + 2.9 + 5.7 = 13.9 4)You spend $3.25 You have $10.00. What is your change? $6.75 5)Half of 450 = 225 6)Multiple 40 groups of 60 = 2400 7)6.5 x 100 = 650 8)Two squared added to three squared = 13 9)6366  3 = 2122 10) 3 groups of 10 3 = 3000

170. Mental Math # 33 1)Double the sum of 100 and 150 = 2)7 x 10 3 + 8 x 10 1 = 3)10.8 - 3.4 = 4)You spend $69.90 You have $100.00. What is your change? 5)50 + 20 000 + 300 = 6)Multiple 100 groups of 3.5 = 7)The quotient of 35 and 5 = 8)Two cubed = 9) 900  10 2 = 10) 8 x 10 3 =

171. Mental Math # 33 1)Double the sum of 100 and 150 = 500 2)7 x 10 3 + 8 x 10 1 = 7080 3)10.8 - 3.4 = 7.4 4)You spend $69.90 You have $100.00. What is your change? $30.10 5)50 + 20 000 + 300 = 20 350 6)Multiple 100 groups of 3.5 = 350 7)The quotient of 35 and 5 = 7 8)Two cubed = 8 9) 900  10 2 = 9 10) 8 x 10 3 = 8000

172. Mental Math # 34 1)The difference of 70 and 50 times 2 = 2)6 x 10 3 + 2 x 10 0 3)21.9 + 7.5 = 4)You spend $25.25 You have $100.00. What is your change? 5)6000 + 70 000 + 49 = 6)Multiple 100 groups of 47 = 7)The quotient of 50 and 10 = 8)Nine squared = 9) 760  10 2 = 10) 5 x 10 3 =

173. Mental Math # 34 1)The difference of 70 and 50 times 2 = 40 2)6 x 10 3 + 2 x 10 0 = 6002 3)21.9 + 7.5 = 29.4 4)You spend $25.25 You have $100.00 What is your change? $74.75 5) 6000 + 70 000 + 49 = 76 049 6) Multiple 100 groups of 47 = 4700 7) The quotient of 50 and 10 = 5 8) Nine squared = 81 9) 760  10 2 = 7.6 10) 5 x 10 3 = 5000

174. Mental Math # 35 1)The product of 60 and 5 added to 49 = 2)50 x 10 2 = 3)250 + 350 + 391 = 4)You spend $79.45 You have $100.00. What is your change? 5)200 + 900 000 + 4000 + 63 = 6)Multiple 1000 groups of 2.3 = 7)The quotient of 555 and 5 = 8)Six squared, minus ten = 9) 570  10 0 = 10) 5 x 10 3 + 9 x 10 1 =

175. Mental Math # 35 1)The product of 60 and 5 added to 49 = 349 2)50 x 10 2 = 5000 3)250 + 350 + 391 = 991 4)You spend $79.45 You have $100.00. What is your change? $20.55 5)200 + 900 000 + 4000 + 63 = 904 263 6)Multiple 1000 groups of 2.3 = 2300 7)The quotient of 555 and 5 = 111 8)Six squared, minus ten = 26 9) 570  10 0 = 570 10) 5 x 10 3 + 9 x 10 1 = 5090

176. Mental Math # 36 1)The difference of 400 and 200 multiplied by 4 = 2)7 x 10 3 = 3)400 + 300 + 342 = 4)You spend $29.52 You have $100.00. What is your change? 5)600 + 7000 + 40 000 + 79 = 6)Multiple 100 groups of 4.53 = 7)The quotient of 372 and 3 = 8)four squared, added to twenty = 9) 451  10 0 = 10) 2 x 10 2 + 9 x 10 1 =

177. Mental Math # 36 1)The difference of 400 and 200 multiplied by 4 = 800 2)7 x 10 3 = 7000 3)400 + 300 + 342 = 1042 4)You spend $29.52 You have $100.00. What is your change? $70.48 5)600 + 7000 + 40 000 + 79 = 47 679 6)Multiple 100 groups of 4.53 = 453 7)The quotient of 372 and 3 = 124 8)four squared, added to twenty = 36 9) 451  10 0 = 451 10) 2 x 10 2 + 9 x 10 1 = 290

178. Mental Math # 37 1)Double 320 = 2)6 x 1000 + 3 x 100 + 2 x 1= 3)2.1 + 2.9 + 5.7 = 4)You spend $3.89 You have $10.00. What is your change? 5)Half of 660 = 6)Multiple 300 groups of 6 = 7)6.5 x 100 = 8)Two squared added to ten squared = 9)6339  3 = 10) 6 groups of 10 3 =

179. Mental Math # 37 1)Double 320 = 640 2)6 x 1000 + 3 x 100 + 2 x 1= 6302 3)2.1 + 2.9 + 5.7 = 10.7 4)You spend $3.89 You have $10.00. What is your change? $6.11 5)Half of 660 = 330 6)Multiple 300 groups of 6 = 1800 7)6.5 x 100 = 650 8)Two squared added to ten squared = 104 9)6339  3 = 2113 10) 6 groups of 10 3 = 6000

180. Mental Math # 38 1)Double 700 = 2)63 000 in scientific notation = 3)100.5 + 100.5 + 100.5 = 4)You spend $5.65 You have $10.00. What is your change? 5)Half of 2010 = 6)Multiple 5 groups of 700 = 7) 0.56 x 100 = 8)The difference of ten squared and five squared = 9)575  5 = 10) 2 groups of 10 3 =

181. Mental Math # 38 1)Double 700 = 1400 2)63 000 in scientific notation = 6.3 x 10 4 3)100.5 + 100.5 + 100.5 = 301.5 4)You spend $5.65 You have $10.00. What is your change? 4.35 5)Half of 2010 = 1005 6)Multiple 5 groups of 700 = 3500 7) 0.56 x 100 = 56 8)The difference of ten squared and five squared = 75 9)575  5 = 115 10) 2 groups of 10 3 = 2000

182. Mental Math # 39 1)Double 2000 added to 342 = 2)780 000 in scientific notation = 3)100.3 x 2 = 4)You spend $50.90 You have $100.00. What is your change? 5)Half of 612 = 6)Multiple 200 groups of 70 = 7) 6.27 x 100 = 8)The sum of ten squared and five squared = 9)715  5 = 10) 8 groups of 10 2 =

183. Mental Math # 39 1)Double 2000 added to 342 = 4342 2)780 000 in scientific notation = 7.8 x 10 5 3)100.3 x 2 = 200.6 4)You spend $50.90 You have $100.00. What is your change? $49.10 5)Half of 612 = 306 6)Multiple 200 groups of 70 = 14 000 7) 6.27 x 100 = 627 8)The sum of ten squared and five squared = 125 9)715  5 = 143 10) 8 groups of 10 2 = 800

184. Mental Math # 40 1)The difference between three groups of five hundred and two hundred = 2)4555.5 in scientific notation = 3)200.2 x 3 = 4)You spend $65.00 You have four $20.00 bills. What is your change? $ 5)Half of 866 = 6)Multiple 20 groups of 150 = 7) 6.27 x 100 = 8)The sum of two squared and three squared = 9)655  5 = 10) 8.1 x 10 2 =

185. Mental Math # 40 1)The difference between three groups of five hundred and two hundred = 1300 2)4555.5 in scientific notation = 4.5555 x 10 3 3)200.2 x 3 = 600.6 4)You spend $65.00 You have four $20.00 bills. What is your change? $15.00 5)Half of 866 = 433 6)Multiple 20 groups of 150 = 3000 7) 6.27 x 100 = 627 8)Sum of two squared and three squared = 13 9)655  5 = 131 10) 8.1 x 10 2 = 810

187. Mental Math # 1 1)The difference between five groups of one hundred and fifty = 2)735 000 in scientific notation = 3)400.5 x 2 = 4)You spend $71.00 You have two $50 bills. What is your change? 5)Half of 1040 = 6)Multiple 30 groups of 70 = 7) 97 x 1000 = 8)Sum of ten cubed and five squared = 9)723  3 = 10) 52 x 10 3 =

188. Mental Math # 1 1)The difference between five groups of one hundred and fifty = 450 2)735 000 in scientific notation = 7.35 x 10 5 3)400.5 x 2 = 801 4)You spend $71.00 You have two $50 bills. What is your change? $29.00 5)Half of 1040 = 520 6)Multiple 30 groups of 70 = 2100 7) 97 x 1000 = 97 000 8)Sum of ten cubed and five squared = 1025 9)723  3 = 241 10) 52 x 10 3 = 52 000

189. Mental Math # 2 1)Three groups of one hundred increased by two hundred forty two = 2)640.01 in scientific notation = 3)200.15 + 500.03 = 4)You spend $36.05 You have two $20 bills. What is your change? 5)Half of 584 = 6)Multiple 35 groups of 200 = 7) 3.4 x 100 = 8)Sum of ten squared and four squared = 9)-7 - +2 = 10) 79 x 10 2 =

190. Mental Math # 2 1)Three groups of one hundred increased by two hundred forty two = 542 2)640.01 in scientific notation = 6.4001 x 10 2 3)200.15 + 500.03 = 700.18 4)You spend $36.05 You have two $20 bills. What is your change? $3.95 5)Half of 584 = 292 6)Multiple 35 groups of 200 = 7000 7) 3.4 x 100 = 340 8)Sum of ten squared and four squared = 116 9)-7 - +2 = -9 10) 79 x 10 2 = 7900

191. Mental Math # 3 1)Three groups of two hundred decreased by one hundred = 2)47 000 in scientific notation = 3)40.1 + 30.22 = 4)You spend $24.50 You have a $50 bill. What is your change? 5)Half of 876 = 6)Multiple 3 groups of 500 = 7) 45 x 1000 = 8)Sum of three squared and five squared = 9)+5 + -7 = 10) 9 x 10 3 =

192. Mental Math # 3 1)Three groups of two hundred decreased by one hundred = 500 2)47 000 in scientific notation = 4.7 x 10 4 3)40.1 + 30.22 = 70.32 4)You spend $24.50 You have a $50 bill. What is your change? $25.50 5)Half of 876 = 438 6)Multiple 3 groups of 500 = 1500 7) 45 x 1000 = 45 000 8)Sum of three squared and five squared = 34 9)+5 + -7 = -2 10) 9 x 10 3 = 9000

193. Mental Math # 4 1)Four groups of twenty decreased by one group of ten = 2)27O 000 in scientific notation = 3)4.1 + 3.9 + 6.5 = 4)You spend $45.00 You have three $20 bills. What is your change? 5)Half of 706 = 6)Multiple 3 groups of 800 = 7) 5 x 1000 + 3 x 100 = 8)Sum of three squared and ten squared = 9)(-5) – (-7) = 10) 5 x 10 3 =

194. Mental Math # 4 1)Four groups of twenty decreased by one group of ten = 70 2)27O 000 in scientific notation = 2.7 x 10 5 3)4.1 + 3.9 + 6.5 = 14.5 4)You spend $45.00 You have three $20 bills. What is your change? $15.00 5)Half of 706 = 353 6)Multiple 3 groups of 800 = 2400 7) 5 x 1000 + 3 x 100 = 5300 8)Sum of three squared and ten squared = 109 9)(-5) – (-7) = +2 10) 5 x 10 3 = 5000

195. Mental Math # 5 1)Four groups of fifty decreased by one group of twenty = 2)94 000 in scientific notation = 3)5.4 + 2.9 + 5.6 = 4)You spend $69.00 You have four $20 bills. What is your change? 5)Half of 524 = 6)5 groups of 500 = 7) 3 x 1000 + 7 x 100 + 5 x 1 = 8)Sum of five squared and ten squared = 9)590 + ? = 1000 10) 6 x 10 3 =

196. Mental Math # 5 1)Four groups of fifty decreased by one group of twenty = 180 2)94 000 in scientific notation = 9.4 x 10 4 3)5.4 + 2.9 + 5.6 = 13.9 4)You spend $69.00 You have four $20 bills. What is your change? $11.00 5)Half of 524 = 262 6)5 groups of 500 = 2500 7) 3 x 1000 + 7 x 100 + 5 x 1 = 3705 8)Sum of five squared and ten squared = 125 9)590 + 410 = 1000 10) 6 x 10 3 = 6000

197. Mental Math # 6 1)Eight groups of one hundred decreased by three hundred fifty = 2)89 100 000 in scientific notation = 3)8.3 + 2.7 + 5.5 = 4)You spend $57.35 You have six $10 bills. What is your change? 5)Half of 966 = 6)40 groups of 50 = 7) 3 x 100 + 9 x 1000 + 5 x 10 = 8)Sum of two cubed and four squared = 9)270 + ? = 1000 10) 4 x 10 1 =

198. Mental Math # 6 1)Eight groups of one hundred decreased by three hundred fifty = 450 2)89 100 000 in scientific notation = 8.91 x 10 7 3)8.3 + 2.7 + 5.5 = 16.5 4)You spend $57.35 You have six $10 bills. What is your change? $2.65 5)Half of 966 = 483 6)40 groups of 50 = 2000 7) 3 x 100 + 9 x 1000 + 5 x 10 = 9350 8)Sum of two cubed and four squared = 24 9)270 + 730 = 1000 10) 4 x 10 1 = 40

199. Mental Math # 7 1)Three groups of two hundred increased by three groups of fifty = 2)5 550 000 in scientific notation = 3)1.5 + 1.5 + 1.5 + 6.5 = 4)You spend $32.50 You have two $20 bills. What is your change? 5)972  3 = 6)30 groups of 500 = 7) (+3) + (-5) = 8)Sum of three cubed and ten squared = 9)I owe seven dollars to my friend. I get my allowance of ten dollars. What is my net worth? = 10) 78 x 10 0 =

200. Mental Math # 7 1)Three groups of two hundred increased by three groups of fifty = 750 2)5 550 000 in scientific notation = 5.55 x 10 6 3)1.5 + 1.5 + 1.5 + 6.5 = 11 4)You spend $32.50 You have two $20 bills. What is your change? $7.50 5)972  3 = 324 6)30 groups of 500 = 15 000 7) (+3) + (-5) = -2 8)Sum of three cubed and ten squared = 127 9)I owe seven dollars to my friend. I get my allowance of ten dollars. What is my net worth? = +3 10) 78 x 10 0 = 78

201. Mental Math # 8 1)Double 150 added to 198 = 2)341.5 in scientific notation = 3)123 x 3 = 4)You spend $40.20 You have five $10.00. What is your change? 5)Half of 276 = 6)Multiple 90 groups of 90 = 7) (-5) - (-8) = 8)Two to the exponent four = 9)6/30 in lowest terms is = 10) 7 groups of 10 0 =

202. Mental Math # 8 1)Double 150 added to 198 = 498 2)341.5 in scientific notation = 3.415 x 10 2 3)123 x 3 = 369 4)You spend $40.20 You have five $10.00. What is your change? $9.80 5)Half of 276 = 138 6)Multiple 90 groups of 90 = 8100 7) (-5) - (-8) = +3 8)Two to the exponent four = 16 9)6/30 in lowest terms is = 1/5 10) 7 groups of 10 0 = 7

203. Mental Math # 9 1)Double 551 = 2)40 500 in scientific notation = 3) 312 x 3 = 4)You spend $73.90 You have four $20.00. What is your change? 5)Half of 724 = 6)Multiple 40 groups of 600 = 7) (5) - (-4) = 8)Two to the exponent five plus five = 9)4/12 in lowest terms is = 10) 12/5 as a mixed number =

204. Mental Math # 9 1)Double 551 = 1102 2)40 500 in scientific notation = 4.05 x 10 4 3) 312 x 3 = 936 4)You spend $73.90 You have four $20.00. What is your change? $6.10 5)Half of 724 = 362 6)Multiple 40 groups of 600 = 24 000 7) (5) - (-4) = +9 8)Two to the exponent five plus five = 37 9)4/12 in lowest terms is = 1/3 10) 12/5 as a mixed number = 2 2/5

205. Mental Math # 10 1)Double 623 = 2)800 000 in scientific notation = 3) 211 x 5 = 4)You spend $53.50 You have three $20.00. What is your change? 5)Half of 872 = 6)Multiple 60 groups of 600 = 7) (1) + (-4) = 8)Five to the exponent two plus ten = 9)3/15 in lowest terms is = 10) 14/3 as a mixed number =

206. Mental Math # 10 1)Double 623 = 1246 2)800 000 in scientific notation = 8 x 10 5 3) 211 x 5 = 1055 4)You spend $53.50 You have three $20.00. What is your change? $6.50 5)Half of 872 = 436 6)Multiple 60 groups of 600 = 36 000 7) (1) + (-4) = -3 8)Five to the exponent two plus ten = 35 9)3/15 in lowest terms is = 1/5 10) 14/3 as a mixed number = 4 2/3

207. Mental Math # 11 1)Which is larger 2/11 or 2/9 = 2)Which is larger 5/11 or 4/7 = 3)Which is larger 0.8 or 0.553 = 4)12/18 in lowest terms = 5)18/4 as a mixed number = 6)3/10 as a percent = 7) 2/25 as a percent = 8)0.05 as a percent = 9)131/100 as a decimal = 10) 9/10 of a bars added to 5/8 of a bar is closer to 1, 1 1/2 or 2 whole bars =

208. Mental Math # 11 1)Which is larger 2/11 or 2/9 = 2/9 2)Which is larger 5/11 or 4/7 = 4/7 3)Which is larger 0.8 or 0.553 = 0.8 4)12/18 in lowest terms 2/3 5)18/4 as a mixed number = 4 1/2 6)3/10 as a percent = 30 % 7) 2/25 as a percent = 8% 8)0.05 as a percent = 5 % 9)131/100 as a decimal = 1.31 10) 9/10 of a bars added to 5/8 of a bar is closer to 1, 1 1/2 or 2 whole bars = 1 1/2

209. Mental Math # 12 1)Which is larger 5/9 or 3/8 = 2)Which is larger 6/10 or 11/20 = 3)Which is larger 0.2 or 0.199 = 4)6/15 in lowest terms 5)15/3 as a mixed number = 6)9/10 as a percent = 7) 11/20 as a percent = 8)0.18 as a percent = 9)235/100 as a decimal = 10) 5/12 of a bars added to 11/20 of a bar is closer to 1, 1 1/2 or 2 whole bars =

210. Mental Math # 12 1)Which is larger 5/9 or 3/8 = 5/9 2)Which is larger 6/10 or 11/20 = 6/10 3)Which is larger 0.2 or 0.199 = 0.2 4)6/15 in lowest terms 2/5 5)15/3 as a mixed number = 5 6)9/10 as a percent = 90 % 7) 11/20 as a percent = 55% 8)0.18 as a percent = 18% 9)235/100 as a decimal = 2.35 10) 5/12 of a bars added to 11/20 of a bar is closer to 1, 1 1/2 or 2 whole bars = 1

211. Mental Math # 13 1)Which is larger 11/20 or 7/18 = 2)Which is larger 20/40 or 5/8 = 3)Which is larger 0.321 or 0.319 = 4)16/20 in lowest terms = 5)7/2 as a mixed number = 6)1/5 of 20 = 7) 5/25 as a percent = 8)0.07 as a percent = 9)34/100 as a decimal = 10) 11/12 + 11/20 of a bar is closer to 1, 1 1/2 or 2 whole bars =

212. Mental Math # 13 1)Which is larger 11/20 or 7/18 = 11/20 2)Which is larger 20/40 or 5/8 = 5/8 3)Which is larger 0.321 or 0.319 = 0.321 4)16/20 in lowest terms = 4/5 5)7/2 as a mixed number = 3 1/2 6)1/5 of 20 = 4 7) 5/25 as a percent = 20% 8)0.07 as a percent = 7% 9)34/100 as a decimal = 0.34 10) 11/12 + 11/20 of a bar is closer to 1, 1 1/2 or 2 whole bars = 1 1/2

213. Mental Math # 14 1)The diagram best represents what percent shaded? 30%, 50% or 70% 2)The diagram best represents what percent shaded? 30%, 50% or 70%

214. 3) The diagram best represents what percent shaded? 30%, 50% or 70% 4) The diagram best represents what percent shaded? 25%, 50% or 75%

215. 5) The diagram best represents what percent shaded? 38%, 50% or 66% 6) The diagram best represents what percent shaded? 33%, 53% or 73%

216. 7) The diagram best represents what percent shaded? 30%, 50% or 70% 8) The diagram best represents what percent shaded? 20%, 40% or 60%

217. 9) The diagram best represents what percent shaded? 25%, 50% or 75% 10) The diagram best represents what percent shaded? 25%, 50% or 75%

218. Mental Math # 14 1)The diagram best represents what percent shaded? 30%, 50% or 70% 2)The diagram best represents what percent shaded? 30%, 50% or 70%

219. 3) The diagram best represents what percent shaded? 30%, 50% or 70% 4) The diagram best represents what percent shaded? 25%, 50% or 75%

220. 5) The diagram best represents what percent shaded? 38%, 50% or 66% 6) The diagram best represents what percent shaded? 33%, 53% or 73%

221. 7) The diagram best represents what percent shaded? 30%, 50% or 70% 8) The diagram best represents what percent shaded? 20%, 40% or 60%

222. 9) The diagram best represents what percent shaded? 25%, 50% or 75% 10) The diagram best represents what percent shaded? 25%, 50% or 75%

223. Mental Math # 15 1)Double the sum of 100 and 150 = 2)7 x 10 3 + 8 x 10 1 = 3)-10 - -2 = 4)You spend $69.90 You have $100.00. What is your change? 5)50 + 20 000 + 300 = 6)Multiple 100 groups of 3.5 = 7)The quotient of 35 and 5 = 8)Two cubed = 9) 900  10 2 = 10) 8 x 10 3 =

224. Mental Math # 15 1)Double the sum of 100 and 150 = 500 2)7 x 10 3 + 8 x 10 1 = 7080 3)-10 - -2 = -8 4)You spend $69.90 You have $100.00. What is your change? $30.10 5)50 + 20 000 + 300 = 20 350 6)Multiple 100 groups of 3.5 = 350 7)The quotient of 35 and 5 = 7 8)Two cubed = 8 9) 900  10 2 = 9 10) 8 x 10 3 = 8000

225. Mental Math # 16 1)The difference of 70 and 50 times 2 = 2)6 x 10 3 + 2 x 10 0 = 3)21.9 + 7.5 = 4)You spend $25.25 You have $100.00 What is your change? 5) 6000 + 70 000 + 49 = 6) Multiple 100 groups of 47 = 7) The quotient of 50 and 10 = 8) Nine squared = 9) 760  10 2 = 10) 5 x 10 3 =

226. Mental Math # 16 1)The difference of 70 and 50 times 2 = 40 2)6 x 10 3 + 2 x 10 0 = 6002 3)21.9 + 7.5 = 29.4 4)You spend $25.25 You have $100.00 What is your change? $74.75 5) 6000 + 70 000 + 49 = 76 049 6) Multiple 100 groups of 47 = 4700 7) The quotient of 50 and 10 = 5 8) Nine squared = 81 9) 760  10 2 = 7.6 10) 5 x 10 3 = 5000

227. Mental Math # 17 1)Double 2000 added to 342 = 2)780 000 in scientific notation = 3)100.3 x 2 = 4)You spend $50.90 You have $100.00. What is your change? 5)Half of 612 = 6)Multiple 200 groups of 70 = 7) $6.27 x 100 = 8)The sum of ten squared and five squared = 9)715  5 = 10) 8 groups of 10 2 =

228. Mental Math # 17 1)Double 2000 added to 342 = 4342 2)780 000 in scientific notation = 7.8 x 10 5 3)100.3 x 2 = 200.6 4)You spend $50.90 You have $100.00. What is your change? $49.10 5)Half of 612 = 306 6)Multiple 200 groups of 70 = 14 000 7) $6.27 x 100 = $627 8)The sum of ten squared and five squared = 125 9)715  5 = 143 10) 8 groups of 10 2 = 800

229. Mental Math # 18 1)2 x 8 x 5 = 2)25 x 22 x 4 = 3)2 x 9 x 50 = 4)4 x 6 x 5 = 5)10 x 4 x 9 x 10 = 6)2 x 50 x 2 x 7 = 7)2 x 9 x 5 x 2 = 8)2 x 4 x 5 x 11 = 9)7 x 3 x 5 x 20 = 10) 2 x 25 x 50 =

230. Mental Math # 18 1)2 x 8 x 5 = 80 2)25 x 22 x 4 = 2200 3)2 x 9 x 50 = 900 4)4 x 6 x 5 = 120 5)10 x 4 x 9 x 10 = 3600 6)2 x 50 x 2 x 7 = 1400 7)2 x 9 x 5 x 2 = 180 8)2 x 4 x 5 x 11 = 440 9)7 x 3 x 5 x 20 = 2100 10) 2 x 25 x 50 = 2500

231. Mental Math # 19 1)4 x 52 x 25 = 2)3 x 4 x 5 x 6 = 3)2 x 3 x 50 = 4)2 x 6 x 500 = 5)10 x 40 x 2 = 6)20 x 5 x 7 x 2 = 7)2 x 9 x 5 x 2 = 8)2 x 4 x 25 x 11 = 9)2 x 2 x 5 x 20 = 10) 2 x 9 x 4 x 5 x 0 =

232. Mental Math # 19 1)4 x 52 x 25 = 5200 2)3 x 4 x 5 x 6 = 360 3)2 x 3 x 50 = 300 4)2 x 6 x 500 = 6000 5)10 x 40 x 2 = 800 6)20 x 5 x 7 x 2 = 1400 7)2 x 9 x 5 x 2 = 180 8)2 x 4 x 25 x 11 = 2200 9)2 x 2 x 5 x 20 = 400 10) 2 x 9 x 4 x 5 x 0 = 0

233. Mental Math # 20 1)6 x 15 x 2 = 2)3 x 5 x 5 x 2 = 3)4 x 5 x 25 x 4 = 4)50 x 6 x 2 x 6 = 5)50 x 4 x 12 = 6)2 x 5 x 7 x 2 = 7)20 x 13 x 5 = 8)4 x 25 x 56 = 9)9 x 2 x 50 x 9 = 10) 2 x 6 x 4 x 5 =

234. Mental Math # 20 1)6 x 15 x 2 = 180 2)3 x 5 x 5 x 2 = 150 3)4 x 5 x 25 x 4 = 2000 4)50 x 6 x 2 x 6 = 3600 5)50 x 4 x 12 = 2400 6)2 x 5 x 7 x 2 = 140 7)20 x 13 x 5 = 1300 8)4 x 25 x 56 = 5600 9)9 x 2 x 50 x 9 = 8100 10) 2 x 6 x 4 x 5 = 240