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13 Cards in this Set
- Front
- Back
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Changing Fractions to Decimals
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Divide the numerator by the denominator. Ex. 3/4 = 0.75 |
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Changing Decimals to Fractions
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Depending on the decimal place, the whole number version of the fraction, should be placed over whatever place the decimal is in. |
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Changing Decimals to Fractions Examples |
Ex. 0.9 = 9/10 (0.9, the 9 is in the tenths place) 0.02 = 2/100 = 1/50 (0.02, the 2 is in the hundreds place...then simplify) 0.25 = 25/100 = 1/4 3.055 = 3 55/1000 = 3 11/200 |
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Ratios and Proportions
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Ratios can be written as: A fraction = 5/12 A colon = 5:12 In words = 5 to 12 Proportion can be written as: 5/12 = 25/60 Note: The numerator is listed 5:12::25:60 first, then the denominator. |
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Ratios and Proportions Change the decimal to a ratio |
0.025 > 25/1000 > 1/40 = 1:40
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Ratios and ProportionsChange the fraction to a ratio
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5/6 = 5:6
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Ratios and Proportions Solve the proportion |
Find the value of x 7:10 :: 14:x Study the example 7/10 = 14/x (see study guide for 7/10 x 2 = 14/x detailed solution) 7/10 = 14/20 x = 20 |
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Ratios and Proportions Solve the proportion |
Find the value of x x:63 :: 24:72 Study the example x/63 = 24/72 (see study guide for 24 x 63 = 1512 detailed solution) 1512/72 = 21 21/63 = 24/72 x = 21 |
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Ratios and Proportions Solve the proportion |
Find the value of x 240:60 :: x:12 Study the example 240/60 = x/12 (see study guide for 240 x 12 = 2880 detailed solution) 2880/60 = 48 240/60 = 48/12 x = 48 |
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Percentages Change the decimal to a percent |
Move the decimal point to the right two places. Examples: 0.13 = 13% 0.002 = 0.2% 0.576 = 57.6% |
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Percentages Change the percent to a decimal |
Move the decimal point to the left two places (away from the percent sign (%). Examples: 85.4% = 0.854 75% = 0.75 57.6% = 0.576 |
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Percentages Change the fraction to a percent |
5/6 divide = .833 > 83.3%
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Percent Formula
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Part/Whole = %/100
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