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backtalk
back talk: Donovan’s computational strategies using the estimation calculator

Robert Q. Berry III 

March 2012, Volume 18, Issue 7, Page 456

Abstract:
A task-based interview is conducted with a fifth grader who is using an iPad application—a modified calculator that gives users visual feedback on their estimates for computational problems.

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Teacher reflection and Figure 3 from back talk: Donovan's computational strategies