22-09-2017
Mathematics

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

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monica201710 monica201710

22-09-2017

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

plz give thanks : )

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jenny259 jenny259

22-09-2017

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

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