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April 21, 2014

Homework Help: math

Posted by esther on Thursday, September 24, 2009 at 3:00pm.

These numbers form an addition and subtraction fact family. 6, 7, 13

Choose the fact family formed by these numbers.

7 + 13 = 20
13 + 7 = 20
13 13 = 0
13 0 = 13


7 + 0 = 7
6 + 0 = 6
13 0 = 13
13 13 = 0


7 + 0 = 7
6 + 0 = 6
13 0 = 13
13 13 = 0


7 + 6 = 13
13 = 7 + 6
13 6 = 7
7 = 13 6

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