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Why Is This Student NOT Showing Good Number Sense in Estimating

Question 28

Essay

Why is this student NOT showing good number sense in estimating 249.738 + 48.246?
"Well, 249 is about 250, and 48 is about 50. 250 + 50 is 300. Then .738 + .246 is about 1. So, my estimate is 301."

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