Christina B.

# Why did they use 2. I don’t understand where the 2 would come from being that neither fraction can be reduced by it.

First problem: -7/8 + (-1/2) ... I solved this by -7•2/8•2 + -1•8/2•8 = -14/16 + -8/16 which gave me -22/16 . But when I was given the problem 6/3 + (-1/6) they didn’t multiply the numerator and denominator by the opposite denominator. Instead they multiplied by 2. Why ?

## 1 Expert Answer

By:

David W. answered • 04/15/18

Tutor
4.9 (85)

Christina B.

But why did they use the common denominator for the second one instead of just multiplying like the first time?
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04/15/18

David W.

tutor
That's a good question. Either way will get you the same answer, as long as you reduce.
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04/15/18

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