Second graders are required to solve double digit addition number problems with and without regrouping. They sometimes have a problem determining whether or not they need to regroup. In this problem they need to explain how they solved it and what tool they used. Most students would choose to use place value blocks or a hundreds or two hundreds chart to prove their answer.
Microsoft Word version: Gr_2_OA_AdditionMultiDigit_Problem_Critique
PDF version: 2_OA_AdditionMultiDigit_Problem_Critique