Ratios, Proportions, & Percent Review

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What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a:b'.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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How do you write a ratio in simplest form?

Back

To write a ratio in simplest form, divide both terms of the ratio by their greatest common divisor.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

Front

How can you determine if two ratios form a proportion?

Back

Cross-multiply the ratios. If the products are equal, the ratios form a proportion.

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CCSS.7.RP.A.2A

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What is a percent?

Back

A percent is a ratio that compares a number to 100, often used to express how much of something there is out of a total.

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How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100.

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What is the formula for finding the percent of a number?

Back

The formula is: Percent = (Part/Whole) x 100.

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If Sally ate 3 pieces of pepperoni pizza and 1 slice of cheese pizza, what is the ratio of cheese pizza to total pizza?

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The ratio is 1:4.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you find the total distance if you know the average distance per day and the number of days?

Back

Multiply the average distance by the number of days.

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CCSS.7.EE.B.3

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If Sheila walked 8.4 km, how do you convert that to miles?

Back

Use the conversion factor: 1 km ≈ 0.621371 miles. So, 8.4 km x 0.621371 = 5.25 miles.

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CCSS.6.RP.A.3D