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23 Cards in this Set
- Front
- Back
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Fractions
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one or more parts of a whole
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numerator
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top number of a fraction
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denominator
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bottom number of a fraction
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quotient
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number you get when you divide the numerator by the denominator may be expressed us a decimal
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Decimal fractions
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same thing as decimals
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decimal digits
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any number to the right of the decimal
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rounding whole numbers
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a process of approximating a number
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rounding to the nearest ten
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31 rounds to 30
37 rounds to 40 35 rounds to 40 |
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Rounding to the nearest hundred
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327 ounds to 300
7878 rounds to 7900 |
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Rounding decimals
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14.4 rounds to 14
17.6 rounds to 18 14.46 rounds to 14.5 14.13 rounds to 14.1 |
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Percentage
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a fraction expressed in hundredths
34% = 34/100 |
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Changing a fraction to %
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divide numerator by denominator and multiply by 100
1/2 = 50% |
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Change a decimal to a percent
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move the decimal right two places
.29 = 29% |
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Change a percent to a fraction
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remove % and multiply by 1/100
5% 5 x 1/100 = 5/100 now reduce by dividing top and bottom by 5 = 1/20 |
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Change a percentage to a decimal
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remove the % and move the decimal two places to the left
76% = .76 |
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Calculaing a ratio
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group of 7 men and 5 women
7:5 7/5 said 7 to 5 group of 6 men and 10 women 6:10 reduce with 2 = 3:5 |
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Ratio
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calculated by dividing one quantity by another
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Proportion
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a ratio in which x is a portion of the whole x + y
the numerator is always included in the denominator |
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Portion as a type of ratio
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two women in a group of 10 had cancer
x=2 and y=8 2/(2+8) = 0.2 |
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rate
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ratio in which there is a distinct relationship between numerator and denominator
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calculating rate
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number of times something happened out of number of times it would have happened. 12/50 12 errors in 50 charts
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Rate formula
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Rate = Part/Base
R = P/B 12/50 12 errors in 50 charts |
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Average
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divide the sum of all the numbers by the number of values
1+2+3+4+5+6= 21 / 6 = 3.5 |
