# 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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