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8 Cards in this Set
- Front
- Back
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Ratio
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A ratio compares two quantities. There are three ways to write a ratio: 8/7, 8:7 and 8 to 7. Ratios that appear as improper fractions are not rewritten as mixed numbers. However, you can rewrite ratios in lowest terms.
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Rate
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A rate is a ratio that measures units having different quantities. A rate shows how quantities with different units are related to each other.
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Unit rate
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A unit rate is a rate with the second quantity is one unit. Unit rates allow you to compare rates easily. 60 miles:2 hour = 60/2 = 30 miles: 1hour = 30 miles per hour. 30 miles per hour is the unit rate.
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Equivalent fractions
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Equivalent fractions name the same number.
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Equivalent ratios or Equivalent rates
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Equivalent ratios and equivalent rates name the same ratio/rates. You find them the same way you find equivalent fractions
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Proportion
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A proportion is a statement that shows two ratios that are equal or proportional. Proportions can be written in number or in words. For example, 1/2 = 3/6. “One is to two as three is to six.”
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Property of cross products
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If two ratios form a proportion, then the cross products are equal. If the two ratios have equal cross products, then they form a proportion.
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Cross product
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In a proportion, the product of one numerator and the other denominator is a cross product. The cross products in a proportion are equal. For example, 2/3 = 6/9 2*9 = 18 and 6*3 = 18.
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