Explain how khnowing 1+7 helps you find the sum for 7+1

asked Nov 11, 2017 139k views

1 vote

by Lodz

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1 vote

1+7=8 and 7+1 is the other way around of 1+7, so if you know the answer to 1+7, then you will know the answer for 7+1

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2 votes

It is simple because of the commutative property that is a+b=b+a so by knowing 1+7 will give us the sum of 7+1

Simpleton answered Nov 17, 2017

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