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Using Ratios to Solve Problems


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Overview

Using Ratios to Solve Problems

We can use what we know about ratios to find percentages. A percent is simply a
rate per 100.

Let’s look at an example.

Approximately 8 out of every 25 people are overweight in the United States. What
percentage of people are overweight in the U.S.?

To solve the problem, we first need to determine the ratio, which is 8 : 25.

Next, we need to determine how many people out of 100 are overweight.

(Unit Rate)
.32 x 100 = 32% (Percent)

We multiply by 100 because a percent represents a rate per 100.
Approximately 32% of people are overweight in the United States.

What if the problem asks you to convert a percent to a number?

Taylor has 50 books on her bookshelf. 20% of the books are nonfiction. How many
books are nonfiction?
We need to multiply 20% by 50. Remember, percent means per 100.

So 20% =

Taylor has 10 nonfiction books on her bookshelf.

 

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The rectangle below represents one whole. What percent of the rectangle is shaded?

The rectangle below represents one whole.
What percent of the rectangle is shaded?

The rectangle below represents one whole.
What percent of the rectangle is shaded?

The rectangle below represents one whole.
What percent of the rectangle is shaded?

The rectangle below represents one whole.
What percent of the rectangle is shaded?

See Related Worksheets:
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The aliens are coming and will only be appeased when students fill in these ratio tables! 6th graders will go ...

Try ArgoPrep for FREE

Learn more Try ArgoPrep for FREE

Share good content with friends and get 15% discount for 12-month subscription

Share in facebook Share in twitter
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