Rates, Ratios, Percentages

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What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other. For example, the ratio of 2 to 3 can be written as 2:3.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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How do you convert minutes to seconds?

Back

To convert minutes to seconds, multiply the number of minutes by 60. For example, 18 minutes is 18 x 60 = 1,080 seconds.

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CCSS.4.MD.A.1

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What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. It is often used to compare relative sizes or to describe discounts.

Front

How do you calculate the percentage discount on an item?

Back

To calculate the percentage discount, subtract the sale price from the original price, divide by the original price, and then multiply by 100. For example, if a book costs $20 and is on sale for $16, the discount is ((20 - 16) / 20) x 100 = 20%.

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CCSS.6.RP.A.3C

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What is 35% of a number?

Back

To find 35% of a number, multiply the number by 0.35. For example, 35% of 70 is 70 x 0.35 = 24.5.

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CCSS.6.RP.A.3C

Front

How many inches are in a foot?

Back

There are 12 inches in a foot.

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CCSS.4.MD.A.1

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What is the formula to convert feet to inches?

Back

To convert feet to inches, multiply the number of feet by 12. For example, 5 feet is 5 x 12 = 60 inches.

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CCSS.4.MD.A.1

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What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It is often expressed as a quantity per one unit of another quantity, such as miles per hour.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you express a ratio in fraction form?

Back

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the difference between a ratio and a rate?

Back

A ratio compares two quantities, while a rate compares two quantities with different units, such as speed (miles per hour).

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CCSS.6.RP.A.3A