Chapter 4‎ > ‎

4.4 Model Regrouping for Addition

http://studyjams.scholastic.com/studyjams/jams/math/addition-subtraction/add-with-regroup.htm
http://www.harcourtschool.com/activity/elab2004/gr3/3.html
http://flash4ed.com/math/regroup.html

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