To: Teacher2Teacher Public Discussion
Your original question about -4 - -4 can also be explained by thinking about the two different meanings of subtraction, take away and difference. Take away: if you have -4 and take away -4 you are left with zero Difference: What is the difference of -4 and -4? Zero I regret that when I was learning about integers I never thought of problems like this but simply applied the rule. In the problem -12- -3 you can take away -3 from -12 and are left with -9. No rule needs to be applied-simply common sense. Yes, math does make sense!!
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