how to: https://learnzillion.com/lessons/1320-find-perimeter-with-missing-side-lengths
practice: http://www.ixl.com/math/grade-3/perimeter-find-the-missing-side-length
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It's been a great couple weeks of school! It's hard to believe that this is my 10th year of teaching! Mrs. Arvidson and I have ...
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