Abstract

During one of my small-group math lessons, I decided to challenge a group of students. Our entire class had been working on basic missingaddend problems throughout the week. The problems had seemed easy for these six students. I had not yet instructed my class on two-digit addition and subtraction, but I gave this small group some two-digit, missing-addend problems. I handed each of them a whiteboard and a marker and told them they could use any strategy they wanted to find the correct answer.

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