Rates and Ratios

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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 convert kilometers to meters?

Back

To convert kilometers to meters, multiply the number of kilometers by 1,000.

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CCSS.4.MD.A.1

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

What is the ratio of pears to all fruit if there are 4 apples, 2 bananas, and 5 pears?

Back

The ratio of pears to all fruit is 5:11.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How do you find a percentage of a number?

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, 5% of 100 is 100 * 0.05 = 5.

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CCSS.6.RP.A.3C

Front

If Vivian pays $178 every 4 months, how much does she pay in a year?

Back

Vivian pays $534 in a year ($178 * 3).

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CCSS.7.EE.B.3

Front

What is the simplest form of the ratio 3 red LEGOS to 6 yellow LEGOS?

Back

The simplest form of the ratio is 1:2.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the total number of fruits if there are 4 apples, 2 bananas, and 5 pears?

Back

The total number of fruits is 11 (4 + 2 + 5).

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CCSS.1.NBT.A.1

Front

How do you express a ratio in simplest form?

Back

To express a ratio in simplest form, divide both quantities by their greatest common divisor.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the formula to calculate the total cost over a period of time?

Back

Total Cost = Cost per period * Number of periods.

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CCSS.4.OA.A.1