Tuesday

March 3, 2015

March 3, 2015

Posted by **p** on Thursday, September 17, 2009 at 10:37am.

- math -
**Ms. Sue**, Thursday, September 17, 2009 at 11:07am1/3 = 7/21

2/7 = 6/21

7/21 + 6/21 = 13/21

21/21 - 13/21 = ?

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