## Practice Makes Perfect

Needs to be integrated from https://cnx.org/contents/CImQfPDv@8.46:NciJ1qa0@19/1-7-Decimals

**Name and Write Decimals**

In the following exercises, write as a decimal.

__531__.

Twenty-nine and eighty-one hundredths

532.

Sixty-one and seventy-four hundredths

__533__.

Seven tenths

534.

Six tenths

__535__.

Twenty-nine thousandth

536.

Thirty-five thousandths

__537__.

Negative eleven and nine ten-thousandths

538.

Negative fifty-nine and two ten-thousandths

In the following exercises, name each decimal.

__539__.

5.5

540.

14.02

__541__.

8.71

542.

2.64

__543__.

0.002

544.

0.479

__545__.

−17.9−17.9

546.

−31.4−31.4

**Round Decimals**

In the following exercises, round each number to the nearest tenth.

__547__.

0.67

548.

0.49

__549__.

2.84

550.

4.63

In the following exercises, round each number to the nearest hundredth.

__551__.

0.845

552.

0.761

__553__.

0.299

554.

0.697

__555__.

4.098

556.

7.096

In the following exercises, round each number to the nearest ⓐ hundredth ⓑ tenth ⓒ whole number.

__557__.

5.781

558.

1.6381

__559__.

63.479

560.

84.28184.281

**Add and Subtract Decimals**

In the following exercises, add or subtract.

__561__.

16.92+7.5616.92+7.56

562.

248.25−91.29248.25−91.29

__563__.

21.76−30.9921.76−30.99

564.

38.6+13.6738.6+13.67

__565__.

−16.53−24.38−16.53−24.38

566.

−19.47−32.58−19.47−32.58

__567__.

−38.69+31.47−38.69+31.47

568.

29.83+19.7629.83+19.76

__569__.

72.5−10072.5−100

570.

86.2−10086.2−100

__571__.

15+0.7315+0.73

572.

27+0.8727+0.87

__573__.

91.95−(−10.462)91.95−(−10.462)

574.

94.69−(−12.678)94.69−(−12.678)

__575__.

55.01−3.755.01−3.7

576.

59.08−4.659.08−4.6

__577__.

2.51−7.42.51−7.4

578.

3.84−6.13.84−6.1

**Multiply and Divide Decimals**

In the following exercises, multiply.

__579__.

(0.24)(0.6)(0.24)(0.6)

580.

(0.81)(0.3)(0.81)(0.3)

__581__.

(5.9)(7.12)(5.9)(7.12)

582.

(2.3)(9.41)(2.3)(9.41)

__583__.

(−4.3)(2.71)(−4.3)(2.71)

584.

(−8.5)(1.69)(−8.5)(1.69)

__585__.

(−5.18)(−65.23)(−5.18)(−65.23)

586.

(−9.16)(−68.34)(−9.16)(−68.34)

__587__.

(0.06)(21.75)(0.06)(21.75)

588.

(0.08)(52.45)(0.08)(52.45)

__589__.

(9.24)(10)(9.24)(10)

590.

(6.531)(10)(6.531)(10)

__591__.

(55.2)(1000)(55.2)(1000)

592.

(99.4)(1000)(99.4)(1000)

In the following exercises, divide.

__593__.

4.75÷254.75÷25

594.

12.04÷4312.04÷43

__595__.

$117.25÷48$117.25÷48

596.

$109.24÷36$109.24÷36

__597__.

0.6÷0.20.6÷0.2

598.

0.8÷0.40.8÷0.4

__599__.

1.44÷(−0.3)1.44÷(−0.3)

600.

1.25÷(−0.5)1.25÷(−0.5)

__601__.

−1.75÷(−0.05)−1.75÷(−0.05)

602.

−1.15÷(−0.05)−1.15÷(−0.05)

__603__.

5.2÷2.55.2÷2.5

604.

6.5÷3.256.5÷3.25

__605__.

11÷0.5511÷0.55

606.

14÷0.3514÷0.35

**Convert Decimals, Fractions and Percents**

In the following exercises, write each decimal as a fraction.

__607__.

0.04

608.

0.19

__609__.

0.52

610.

0.78

__611__.

1.25

612.

1.35

__613__.

0.375

614.

0.464

__615__.

0.095

616.

0.085

In the following exercises, convert each fraction to a decimal.

__617__.

17201720

618.

13201320

__619__.

114114

620.

174174

__621__.

−31025−31025

622.

−28425−28425

__623__.

15111511

624.

18111811

__625__.

1511115111

626.

2511125111

__627__.

2.4+582.4+58

628.

3.9+9203.9+920

In the following exercises, convert each percent to a decimal.

__629__.

1%

630.

2%

__631__.

63%

632.

71%

__633__.

150%

634.

250%

__635__.

21.4%

636.

39.3%

__637__.

7.8%

638.

6.4%

In the following exercises, convert each decimal to a percent.

__639__.

0.01

640.

0.03

__641__.

1.35

642.

1.56

__643__.

3

644.

4

__645__.

0.0875

646.

0.0625

__647__.

2.254

648.

2.317

### Everyday Math

__649__.

**Salary Increase** Danny got a raise and now makes $58,965.95 a year. Round this number to the nearest

ⓐ dollar

ⓑ thousand dollars

ⓒ ten thousand dollars.

650.

**New Car Purchase** Selena’s new car cost $23,795.95. Round this number to the nearest

ⓐ dollar

ⓑ thousand dollars

ⓒ ten thousand dollars.

__651__.

**Sales Tax** Hyo Jin lives in San Diego. She bought a refrigerator for $1,624.99 and when the clerk calculated the sales tax it came out to exactly $142.186625. Round the sales tax to the nearest

ⓐ penny and

ⓑ dollar.

652.

**Sales Tax** Jennifer bought a $1,038.99 dining room set for her home in Cincinnati. She calculated the sales tax to be exactly $67.53435. Round the sales tax to the nearest

ⓐ penny and

ⓑ dollar.

__653__.

**Paycheck** Annie has two jobs. She gets paid $14.04 per hour for tutoring at City College and $8.75 per hour at a coffee shop. Last week she tutored for 8 hours and worked at the coffee shop for 15 hours.

ⓐ How much did she earn?

ⓑ If she had worked all 23 hours as a tutor instead of working both jobs, how much more would she have earned?

654.

**Paycheck** Jake has two jobs. He gets paid $7.95 per hour at the college cafeteria and $20.25 at the art gallery. Last week he worked 12 hours at the cafeteria and 5 hours at the art gallery.

ⓐ How much did he earn?

ⓑ If he had worked all 17 hours at the art gallery instead of working both jobs, how much more would he have earned?

### Writing Exercises

__655__.

How does knowing about US money help you learn about decimals?

656.

Explain how you write “three and nine hundredths” as a decimal.

__657__.

Without solving the problem “44 is 80% of what number” think about what the solution might be. Should it be a number that is greater than 44 or less than 44? Explain your reasoning.

658.

When the Szetos sold their home, the selling price was 500% of what they had paid for the house 30 years ago. Explain what 500% means in this context.

### Self Check

ⓐ After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

ⓑ What does this checklist tell you about your mastery of this section? What steps will you take to improve?