Q&A #6433

Teachers' Lounge Discussion: Subtracting integers

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From: Lisa Phipps

To: Teacher2Teacher Public Discussion
Date: 2005032311:23:22
Subject: math

My daughter is learning subtraction of intergers and it's been years since I've done them. When do you change the sign for the second number? and why? She has -5 + +7=. he teacher told her she needed to change it to -5 - -7=. Why do you change it? On the first one I would get +2 and on the second one I would get -2. Is this correct?

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