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14 Cards in this Set
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- Back
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Ratio
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A comparison of two quanities with the same units.
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Proportion
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A statement that two ratios are equal
a/b = c/d , where b,d are not equal to 0. |
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How are ratios written?
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a to b, a : b, a/b
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Percents
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Are ratios in which the second number is always 100.
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Unit rate
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compares the price to the number of units:
$1.50/8oz = $0.083 |
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What are the terms of the proportion
a/b = c/d |
a,b,c, and d
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What are the extremes of the proportion
a/b = c/d |
a & d
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What is the means of the proportion
a/b = c/d |
c & b
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How do you find the product of
a/b = c/d |
Multiply diagonally
a x d and b x c |
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Cross Products
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the cross multipier in the proportion
a/b = c/d , are ad and bc |
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Can the proportion
a/b = c/d , also can be written; ac = bd |
True
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How do you determine if a proportion is true?
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check to see if the cross products are equal
a/b = c/d ; a x d = b x c |
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How do you find the unknown in a proportion?
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four numbers are used in a proportion. If any three of these numbers are known the fourth can be found:
5/9 = x/63 5 x 63 = 9x 315 = 9x 315/9 = 9x/9 35 = x |
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When can the cross product method can't be used directly?
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If there is more than one term on either side of the equal symbol.
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