6th Grade Decimals REVIEW

Rounding-No Boards

100

2.25 rounded to the nearest whole number

2

200

26.963 rounded to the nearest hundredth

26.96

300

17.09 rounded to the nearest tenth

17.1

400

49.95 rounded to the nearest tenth

50

500

313.5687 rounded to the nearest thousandth No boards!

313.569

Estimating-No Boards

100

Estimate the sum of 7.4 + 3.7

7+4=11

200

Estimate the difference of 17.97 - 6.80

18 - 7 =11

300

Estimate the product of 29.69 x 10 =

30 x 10 = 300

400

Estimate the product of 61.21 x 3.84

60 x 4 = 240

500

Estimate the quotient of 238.1 divided by 3.89

240 divided by 4 equals 60

or 200 divided by 4 equals 50

or 200 divided by 5 equals 40

Add or Subtract - Use Boards

100

8.74 - 5.43 =

3.31

200

12.07 + 7.9 =

19.97

300

24.50 + 11.78 + 6.841

43.121

400

15.1 - 4.63 =

10.47

500

348.3 - 89.567 + 45 =

258.663

Multiply or Divide-Use Boards

100

6.1 x 100

610

200

6.2 divided by 100

.062

300

6.15 x 5.8

35.67

400

6.88 divided by 3.2

2.15

500

1.452 divided by .24

6.05

**RANDOM **- No Boards

100

Say this decimal out loud: 542.31

Five hundred forty-two and thirty-one hundredths

200

Which is greater and WHY? 31.521 or 31.64

31.64 is greater because both numbers have 31 wholes, but this decimal has a 6 in the tenths place. That is the largest decimal place that matters. OR if we changed them so both numbers went to the thousandths decimal place, they would look like this: 31.521 or 31.640 It is clear to see here that 31.640 is larger.

300

I bought 3.5 pounds of turkey for a total of $35.82. How much did each pound cost? 

a. ESTIMATE the final answer  

b. Get a board and solve it! 

Give your final answer as a money amount.

a. Estimate = 40 divided by 4 = $10 

b. Solution =10.234... When this answer is shown as a dollar amount, we must round it to the hundredths place. 

FINAL ANSWER = It costs $10.23 for each pound of turkey

400

Put these decimals in order from least to greatest: 1.5,     1.09,     1.325,     1.46

Least = 1.09,     1.325,     1.46,     Greatest= 1.5

500

Which of the following numbers could make this statement true?

5.39  x ______  <  5.39

4.9          0.99             1.5                32               0.76

      0.99                       0.76

ONLY THE NUMBERS THAT ARE LESS THAN 1 WILL PRODUCE AN ANSWER LESS THAN 5.39