Assessing the Reasonableness of Quotients with Compatible Numbers

The video tutorial explains how to assess the reasonableness of division answers by using compatible numbers. It introduces the concept of checking answers for mathematical sense and demonstrates this through two examples. In the first example, Danielle's division of 413 by 7 is analyzed, showing that her answer is not reasonable. In the second example, Tracy's division of 5625 by 9 is examined, and her answer is found to be reasonable. The tutorial emphasizes the importance of using compatible numbers to estimate and verify division results.

What compatible number did Tracy use to assess her division problem?

In what way did the multiples of nine help in assessing Tracy's answer?