6th Grade Math Textbook, Fundamentals

Lesson 7-5 for exercise sets. &KDSWHU 

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Use the percent formula to find each percent.

1.What percent of 200 is 11? 2.0.3 is what percent of 0.5? 3.125 is what percent of 25?

4.For an important test, Juan studied for 2 h 20 min, while Ken studied for

two thirds of an hour. What percent of Ken’s study time was Juan’s?

Use a proportion to find each percent.

5.What percent of 2.5 is 2? 6.4.6 is what percent of 25? 7. What percent is of 10?

8.Ralph made 12 of his 25 free-throw attempts, while Maria made 20 of 50 attempts.

Who made the higher percent of free throws? How much higher?

9.Discuss and Write Show how you could use the fraction to solve

the opening problem about questionnaires. Tell which approach you

prefer, and explain why you prefer it.

350

500

1

5

What percent of 20 is 0.5? Use the formula.

r• bp

r• 200.5 Substitute 20 for band 0.5 for p.



r  Simplify.

r 0.0252.5%

So 0.5 is 2.5% of 20.

Divide both sides by 20

to isolate r.

0.5

20

0.5

20

Divide. Rename the

decimal as a percent.

r• 20

20

1 30 is what percent of 8? Use a proportion.

Let nthe unknown percent.

 Write the proportion.

30 • 100  8 n Cross multiply.



375 n

So 30 is 375% of 8.

Divide both sides

by 8 to isolate n.

8 n

8

3000

8

n

100

30

8

2

A circle graph shows how Earl’s cat spends

a 24-hour day. A 45° angle forms the section

of the circle representing the time the cat

spends eating. What percent of a day does

the cat spend eating? Use a proportion.

Let nthe unknown percent.

 Write a proportion.

45 • 100  360 n Cross multiply.



12.5 n

Earl’s cat spends 12.5% of a day eating.

Divide both sides

by 360 to isolate n.

360 n

360

4500

360

n

100

45

360

3 What percent of 10 is?

Use the formula.

r • bp

r• 10  Substitute for pand 10 for b.



r •

r 5%

So is 5% of 10.^12

Rename the

fraction as a

percent.

5

100

1

20

Multiply by the

reciprocal of 10.

1

10

1

2

r• 10

10 Divide both sidesby 10 to isolate r.

1

2

1

2

10

1

2

1

(^42)