1. Ms. Crusenberry
9-2013

2. Place Value

3. Name the Place Value of the Underlined Number
867.43
6.2395
9.3765

4. Answers
Hundredths
Tenths
Thousandths
Ten-thousandths

5. Comparing
Ex: __<___ All numbers are the same until you get to 6 in the first set and 7 in the second set. The 7 is bigger; therefore is the larger number.

6. Practice 3.6 _____ 3.486 17.228 _____ 17.28 0.023 _____ 0.00981
3.537 _____ 3.536

7. Answers
>
<

8. Multiple Numbers Which numeral is the largest? 5.332 5.359 5.317

9. Answers

10. Ordering Decimals
You do this based on their place value. Ex: smallest to largest answer: Ex: largest to smallest answer:

11. Practice – Smallest to Largest

12. Answers

13. Practice – Largest to Smallest

14. Answers

15. Rounding Decimals
Rule – the number 5 or above to the right of the place value you are rounding to makes the number go up by one; 4 or less the number stays the same Ex. Round to the nearest tenth = 4.600

16. Practice
Round to the nearest tenths a) 2.34 b) c) Round to the nearest hundredths d) e) f) .066 Round to the nearest thousandths g) h) i)

17. Answers
2.30
42.30
5.820
2.120
.070
.00060

18. Adding Decimals
Rule – you must line up the decimals; fill in with zeros if needed Ex:

19. Practice

20. Answers
37.768
66.112
86.093
15.254

21. Subtracting Decimals
Rule – the same rule applies here that you did in adding decimals: line up the decimals and add zeroes if need be Ex: –

22. Practice
15.6 – 2.34
5.8 – 2.14

23. Answers
13.26
3.66
4.777
2.6

24. Multiplying Decimals
Rule – when multiplying decimals, count the number of decimal places in the problem to determine where to put the decimal point in the answer Ex: x two places x 4.2 one place three places

25. Practice
2.3 x 4.5
8.71 x 2.6
355 x 2.78
23.45 x 1.8

26. Answers
10.35
22.646
986.9
42.21

27. Diving by a whole number
Dividing Decimals
Diving by a whole number
Rule – do not move the decimal inside the division house, bring it up into the answer Ex:

28. Continued Dividing by a decimal
Rule – move the decimal outside the division house the amount of places you need to make a whole number Rule 2 – however many places you move the decimal outside of the division house, you must move it that many places on the inside of the division house

29. Example No. 1 so

30. Example No 2
**you will have to add a decimal and a 0 in order to move it inside the division house

31. Practice
21.04 ÷ 8
37.38 ÷ 6
9.36 ÷ .6
13.95 ÷ .9
47 ÷ .8
315 ÷ .9

32. Answers
2.63
6.23
15.6
15.5
58.75
350

33. Renaming Fractions as Decimals
Rule – Remember your decimal place value

34. Examples
Rule - Place value is determined by the last number of the decimal; then reduce as needed .012 = 12/1000 = 3/ = 65/100 = 13/20 .7 = 7/10

35. Practice
.82
.0198
.40
3.84
.19
.248

36. Answers
.82 = 82/100 = 41/50
198/10,000 = 99/5000
40/100 = 4/10 = 2/5
3 84/100 = 3 21/25
19/100
248/1000 = 31/125

37. Renaming Fractions as Decimals
Rule – Divide the numerator by the denominator .3
Ex. 3/

38. Practice
2/5
9/100
16/25
3/40
9/16
7/10

39. Answers .4
.09
.64
.075
.5625 .7

40. Repeating Decimals
Ex. 3/ **use rounding rules answer is

41. Practice **divide to four places, round to three places 19/22 2/33 5/6
4/9
10/11
2/3

42. Answers
.864
.061
.833
.445
.909
.667