View entire discussion
[<< prev] [ next >>]
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?
Math Forum Home || The Math Library || Quick Reference || Math Forum Search