Review over Ratios and Proportions

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What is a ratio?

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A ratio is a comparison of two quantities by division, expressed as 'a to b' or a:b.

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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 (GCD).

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What is a proportion?

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

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How do you solve a proportion?

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To solve a proportion, cross-multiply and then solve for the unknown variable.

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What is the scale factor in a model?

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The scale factor is the ratio of a length in the model to the corresponding length in the actual object.

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This implies that the cross products are equal: a*d = b*c.

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What is the ratio of boys to girls if there are 18 boys in a class of 30 students?

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The ratio of boys to girls is 3:2.

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How do you convert feet to inches?

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Multiply the number of feet by 12, since there are 12 inches in a foot.

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