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Fact families |
2009-08-24 |
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Camasha pose la question :
I am trying to help my daughter with fact families. I understand the premise from your previous explanation on the site . Generally when applying addition and subtraction their are two add and two subtraction utilizing all three numbers. However what do you do when you have a series like like 9, 9, 18
Penny Nom lui répond. |
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