Why is 3 – 5 = 3 + (-5)?

Why is 3 – 5 = 3 + (-5)?

by | Oct 31, 2018 | Grades 6–8

By William McCallum You will never have to subtract again. Students sometimes learn about addition and subtraction of integers using integer chips. These are circular chips, with a yellow chip representing +1 and a red chip representing -1. You start with the...
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