Concept explainers
Problem: Matteo is 4 feet 3 inches tall. Nico is 3 feet 11 inches tall. How much taller is Matteo than Nico?
Sarah solved this problem as follows:
So Sarah gave 2 inches as the answer. Is Sarah right? If not, explain what is wrong with her method, and show how to modify her method of regrouping to make it correct. (Do not start from scratch.)
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