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9 August, 09:05

How to subtract fractions with unlike denominators khan academy?

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  1. 9 August, 11:39
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    First find the LCD of the denominators then convert the fractions. Then you can subtract.

    for example

    2/7 - 1/4

    LCD of 4 and 7 is 28 so we convert to fractions with denominator 28

    1/4 = 1*7 / 4*7 = 7 / 28

    2/7 = 2*4 / 7*4 = 8/28

    so 2/7 - 1/4 = 8 / 28 / 7/28 = 1/28 answer
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