1. Unit 2 Estimation and Computation

2. Use the following number 5, 678.231 to answer questions 1 and 2. 1. What digit is in the hundreds place? a. 5 b. 6 c. 3 d. 1 2. What digit is in the tenths place? a. 2 b. 3 c. 1 d. 7

3. 3. Without using computation, what is 34 * 10,000? a. 34, 000 b. 3, 400 c. 340, 000 d. 3, 400, 000

4. Lesson 2-1: Place Value What value is the digit 5 3,057,129.486 What value is the digit 6 What value is the digit 2 What value is the digit 0 What value is the digit 8 What value is the digit 3 What value is the digit 1 What value is the digit 4 ten thousand thousandths tens hundred thousand hundredths millions hundred tenths

5. Lesson 2-1: Rules of Rounding underline place value you are rounding to look one place to the right 5 or more raise the score 4 or less let it rest all numbers to the left of underlined number stays the same Examples: 4,827 rounded to the nearest ten is 4,830 4,827 rounded to the nearest hundred is 4,800 4,827 rounded to the nearest thousand is 5,000

6. number1101001,000 3,471.2 12,673 75,485.6 3,286 4,249.7 6,810.8 Round each number to the nearest... 6,811 4,250 6,8106,8007,000 4,2504,200 4,000 3,286 75,486 12,673 3,471 3,2903,300 75,49075,50075,000 12,670 12,70013, 000 3,470 3,5003,000

7. Number1001010.10.01 549.812 2.8907 4,408.93 8.5439 Round each number to the nearest... 500 550 549.8 549.81 XX X X 32.92.89 4,4004,4104,409 4,408.9 9 8.58.54

8. Fill in the blanks using, or = 34.5 _____ 34 0.245 _____ 0.25 0.1 _____0.100 1.245 _____0.345 0.201 _____0.21 0.24 _____0.24000 0.045 _____0.450 1,234.05 _____1,234.06 0.65 _____0.0065 > > > > > > > > >

9. Classwork: 1. Begin rounding and place value packet If time: 2. Math Box 2- 1 (p. 31) 3. Extra Credit

10. Standard NotationExpanded Notation Lesson 2-2: Expanded Notation 39.02 123 100 + 20 + 3 4,916 5.78 302.6 90.005 30 + 9 + 0.02 4,000 + 900 + 10 + 6 5 + 0.7 + 0.08 300 + 2 + 0.6 90 + 0.005

11. Lesson 2-2: Partial Sums Addition 348 + 177 359 + 298 2064 + 382 2064 + 382 1000 100 10 1 2419 + 536 Keep an open mind. When working on your own, you only need to use this strategy for one problem.

12. 4.65 + 3.25 22.62 + 1.7 5.8 + 2.49 Remember to line up the decimal points

13. Classwork: 1. Complete journal page 32- 33 If time: 2. Math Box 2-2 (p. 34) 3. Extra Credit

14. Lesson 2-3: Trade First Keep an open mind. When working on your own, you only need to use this strategy for one problem. 463 - 275 809 - 537 600 - 397

15. 67.35 - 9.59 50.30 - 2.42 89.67 - 2.98

16. Classwork: 1. Complete journal page 35 If time: 2. Math Box 2-3 (p. 36) 3. Extra Credit

17. Lesson 2-4: Addition and Subtraction Number Stories Number Sentences Open Number Sentences Use math symbols instead of words can be true or false must use a relation symbol =, must use an operational symbol +, - *, ÷ Examples 2 + 2 = 4 true 6 * 4 > 2 + 8 true 3 < 9 false contain a variable -letter that represents a number Examples Solution (variable equals) Answer (unit label) 5 + B = 12 B = 7 D ÷ 3 = 8 3 * 4 = V 120 - C = 60 D = 24 V = 12 C = 60

18. At breakfast, the temperature outside was 47˚F. By lunchtime, the temperature was 63˚F. How many degrees warmer was it by lunchtime? Open number sentence Solution: Answer: Mary had $32.50 in her savings account. After she withdrew some money, she had $17.25 left. How much money did she withdraw? The school library has 486 fiction books and 321 non fiction books. How many books does the library have in all? Open number sentence Solution: Answer: Open number sentence Solution: Answer: Mr. Snow is 49 years old. Her son, Kevin, is celebrating his 24th birthday today. Mr. Snow is 6 years older than Mrs. Snow. How old was Mrs. Snow when Kevin was born? Open number sentence Solution: Answer:

19. Classwork: 1. Complete journal page 37 & 38 If time: 2. Math Box 2-4 (p. 39) 3. Extra Credit

20. Lesson 2-5: Statistical Landmarks Minimum: lowest number Maximum: highest number Range: highest number minus the lowest Mode: the number that occurs most often. there can be one mode, more than one or none Median: the middle number when all the numbers are arranged in numerical order. Mean: the average - add all the numbers, divided by the number of numbers you have.

21. Practice: 10, 7, 1, 2, 10, 6, 4, 8 minimum maximum range mode median mean

22. Classwork: 1. Complete journal page 40 - 41 If time: 2. Math Box 2-5 (p. 42) 3. Extra Credit

23. Lesson 2-7: Magnitude Estimates

24. Lesson 2-8: Multiplication of Whole Numbers & Decimals

25. Lesson 2-10: Powers of ten