1. { Math Review Unit 2 Miss Bowen 4 th Grade Math

2. 37+0=37 True or False?

3. 37+0=37 True- The identity property tells us that any # plus zero= that #

4. 99-0=98 True or False?

5. 99-0=98 False- Any # minus zero =that #, no more and NO LESS

6. 17+13=13+17 True or False?

7. 17+13=13+17 True- The Commutative property tells us that the order in which numbers are added does not change the sum.

8. 97+27=17+97 True or False?

9. 97+27=17+97 False- The same numbers were not added on both sided of the equation.

10. (15+5)+10=(10+5)+15 True or False?

11. (15+5)+10=(10+5)+15 True- The associative property tells us that the way in which numbers are grouped when added does not change the sum.

12. 37+ _____= 19+37 Fill in the missing number.

13. 37+ _____= 19+37 37+19=19+37 We must add the same numbers on both sides of the equation. We had 37 on both sides, but only 19 on the right. We must also add 19 to the left.

14. 100 more than 6,785

15. 100 more than 6,785= 6,785+100=6,885 “More than” tells us that we need to use addition.

16. 1,000 less than 14,998

17. 14,998-1,000=13,998 “Less than” tells us that we need to use subtraction.

18. 10 less than 596

19. 596-10=586 “Less than” tells us that we need to use subtraction.

20. 6,788; 7,788; _______; 9,788 Fill in the missing number.

21. 6,788; 7,788; _______; 9,788 1,000 more; 8,788

22. 999; 1,000; 1,001; _______; 1,003 Fill in the missing number.

23. 999; 1,000; 1,001; _______; 1,003 1 more; 1,002

24. 23,486; 23,476; _________; 23, 456 Fill in the missing number.

25. 23,486; 23,476; _________; 23, 456 10 less; 23, 466

26. 2,838+200= Solve the equation

27. 2,838+200= 3,038

28. 303+98=

29. 303+98= 401

30. 1,620+804=

31. 1,620+804= 2,424

32. 37+16=

33. 37+16= 53

34. 5,330+999=

35. 5,330+999= 6,329

36. 6,561-272=

37. 6,561-272= 6,289

38. 3,811-428=

39. 3,811-428= 3,383

40. 7,785-1,494=

41. 7,785-1,494= 6,291

42. 77,000-31,470=

43. 77,000-31,470= 45,530

44. 660,000-83,259=

45. 660,000-83,259= 576,741

46.  There are 12,465 fans attending the local football game this week. Last week, 16,038 fans came out for the game. How many more fans attended last week’s game than this week’s game? Word Problems

47. Understand 12,465 fans this week 16,038 fans last week PlanHow many more= subtraction (-) 16, 038-12,465= Solve16, 038-12,465= 3573 CheckDoes 3,573+12,465=16,038? Yes- our answer is correct. There are 12,465 fans attending the local football game this week. Last week, 16,038 fans came out for the game. How many more fans attended last week’s game than this week’s game?

48.  Riley ran 1,025 meters at the track meet. Elizabeth ran 1,280 meters. How many more meters did Elizabeth run than Riley? Word Problems

49. Understand Riley- 1,025 m Elizabeth- 1,280 m PlanHow many more= subtraction (-) 1,280-1,025= Solve1,280-1,025= 255 CheckDoes 1,025+255=1,280? Yes- our answer is correct. Riley ran 1,025 meters at the track meet. Elizabeth ran 1,280 meters. How many more meters did Elizabeth run than Riley?

50.  Betty’s Bakery sells 2,012 muffins each week. They also sell 5,025 cookies and 416 cakes each week. What is the total number of baked goods sold at the bakery each week? Word Problems

51. Understand 2,102 muffins 5,025 cookies 416 cakes PlanTotal number= addition (+) 2,102+5,025+416=? Solve2,102+5,025+416=7,543 CheckDoes 7,543-2,102-5,025-416=0? Yes- our answer is correct. Betty’s Bakery sells 2,012 muffins each week. They also sell 5,025 cookies and 416 cakes each week. What is the total number of baked good sold at the bakery each week?

52.   Madelyn and her mother baked 48 cookies. She took 24 cookies to school and her brother ate some too. They now have 18 cookies. How many cookies did Madelyn’s brother eat? Word Problems

53. Understand 48 cookies baked Took 24 to school Now 18  How many did her brother take? PlanTook= subtraction (-) Brother takes= subtraction 48-24-18=________ Solve48-24=24 24-18=6 Her brother took 6 cookies. CheckDoes 18+6+24= the original # of cookies (48)? Yes- our answer is correct. Madelyn and her mother baked 48 cookies. She took 24 cookies to school and her brother ate some too. They now have 18 cookies. How many cookies did Madelyn’s brother eat?

54.   Hannah’s choir group is selling coupon books for charity. Hannah sold 23 books and her friend Meghan sold 31. They have 6 books left to sell. How many total books did the two girls have to sell? Word Problems

55. Understand Hannah sold 23 Meghan sold 31 6 left PlanTotal number= addition (+) 23+31+6=___________ Solve23+31=54 54+6=60 60 is the total number of books that the girls must sell. CheckDoes 60-6-31-23=0? Yes- our answer is correct. Hannah’s choir group is selling coupon books for charity. Hannah sold 23 books and her friend Meghan sold 31. They have 6 books left to sell. How many total books did the two girls have to sell?

56.   Estimate the sum or difference by rounding each number to the nearest tens.   Keith owns 8,749 books and Mike owns 5,756 books. About how many books do they have together? Word Problems

57. Understand Mike 5,756 Books Keith 8,749 Books PlanTogether= addition (+) Rounding to the nearest tens Solve5,756  5,760 8,749  8,750 5,760+8,750= 14,510 CheckIs the true answer within 10? 5,756+8,749=14,505 Yes, our answer is correct. Estimate the sum or difference by rounding each number to the nearest tens. Keith owns 8,749 books and Mike owns 5,756 books. About how many books do they have together?

58.   Estimate the sum or difference by rounding each number to the nearest hundreds.   Mike decided to drive across America. He drove 8,618 miles the first week, and 3,272 miles the second week. About how many miles did Mike drive in total? Word Problems

59. Understand 8,618 Miles (Week 1) 3, 272 Miles (Week 2) PlanIn total= addition (+) Rounding to the nearest hundreds Solve8,618  8,600 3,272  3,300 8,600+3,300= 11,900 CheckIs the true answer within 100? 8,618+3,272=11,890 Yes- our answer is correct. Estimate the sum or difference by rounding each number to the nearest hundreds. Mike decided to drive across America. He drove 8,618 miles the first week, and 3,272 miles the second week. About how many miles did Mike drive in total?