Assessing the Reasonableness of Subtraction Using Rounding

The video tutorial explains how to assess the reasonableness of subtraction problems by using rounding. It introduces the concept of rounding to the leftmost place of the smallest number to check if a subtraction result is reasonable. Two examples are provided: Dana's problem, where the answer is reasonable, and Larry's problem, where the answer is not. The tutorial concludes by reinforcing the importance of using rounding to verify the reasonableness of answers.

What is one way to check if an answer is reasonable or makes mathematical sense?

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How do you determine which place to round to when assessing the reasonableness of subtraction problems?

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What rounding method was used to check Dana's subtraction problem?

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Why is it important to round both numbers to the same place when checking subtraction problems?

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Explain why Larry's answer of 971,000 was not reasonable after subtracting 38,000.

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