Introduction to Ratios

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What is a ratio?

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A ratio is a comparison of two quantities that shows the relative size of one quantity to another.

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How can you express a ratio?

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A ratio can be expressed in three ways: using a colon (e.g., 3:4), as a fraction (e.g., 3/4), or in words (e.g., 3 to 4).

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What is the ratio of 9 bananas to 4 apples?

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9:4

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What type of ratio is '5 out of 23 kids play the trumpet'?

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Part-to-whole ratio.

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What is the ratio of boys to girls if there are 13 boys and 10 girls?

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13:10

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If Ella has 5 balloons and Taylor has 7 balloons, what is the ratio of Ella's balloons to Taylor's balloons?

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5:7

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What does a part-to-part ratio compare?

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A part-to-part ratio compares two parts of a whole.

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What does a part-to-whole ratio compare?

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A part-to-whole ratio compares a part of a whole to the whole itself.

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If there are 12 red marbles and 8 blue marbles, what is the ratio of red to blue marbles?

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12:8 or simplified to 3:2.

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How do you simplify a ratio?

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To simplify a ratio, divide both terms by their greatest common divisor.

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