6th Grade Math Textbook, Fundamentals

Lesson 7-4 for exercise sets. &KDSWHU 

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Use the percent formula to find each percentage.

Rename the percent as a decimal or fraction.

1.40% of 45 2.3% of 80 3.111% of 32 4.0.6% of 30

5.Erica took a 19-hour plane ride. She slept for about 30% of the time.

For about how long was she asleep?

Use a percent proportion to find each percentage.

6.60% of 40 7.115% of 90 8.8% of 260 9.0.4% of 50

10.Lake Superior is 350 miles in length. Avery kayaked 35% of the distance.

How many miles did Avery travel in his kayak?

11.Discuss and Write When finding a percentage of a number, when might

you prefer to express the percent as a fraction rather than as a decimal?

Provide an example to support your reasoning.

How many degrees are in a section of a circle that is 24%

of the whole circle?

Find 24% of 360°.

r• bp

24% of 360 0.24 • 360

86.4 Simplify.

The section of the circle measures 86.4°.

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The mass of Earth expressed in scientific notation is 5.974     1024 kg.

What is 50% of Earth’s mass?

r• bp

5.974   1024 p 50%  , so substitute for r.

    1024 p Divide like terms.

2.987   1024 p Write in scientific notation.

So 50% of Earth’s mass is 2.987     1024 kg.

5.974

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You can use the percent formula or a percent proportion to solve

measurement problems.

Hint

A circle measures 360°.