Algebra 1

What is 2/7 - 1/4 + 9/14? What is the LCD? And how did you find it?

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  1. 2/7 - 1/4 + 9/14

    One way to find the LCD is to find the multiples of the largest denominator. It must be also divisible by the other denominators.

    14, 28, 42

    Ah -- 28 is also divisible by 7 and 2.

    The LCD is 28.

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    Ms. Sue

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