Explain how knowing 1 + 7 helps you find the sum of 7 + 1

asked Nov 24, 2018 106k views

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6 votes

It helps you because it is the same the only that is different is that the 7 is first

Jot EN answered Nov 25, 2018

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7 votes

They are backwards so you can use them like that but just not with subtraction

plz give thanks : )

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