cbroom cbroom
  • 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 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 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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