Assessing the Reasonableness of Sums with Rounding

The video tutorial explains how to assess the reasonableness of sums by using rounding. It introduces the concept of rounding to the leftmost place of the smallest number to ensure consistency. Two examples are provided: Lucinda's problem, where rounding to the nearest ten confirms her sum is reasonable, and Tasha's problem, where rounding to the hundreds place reveals a significant error. The lesson concludes by reinforcing the importance of checking the reasonableness of sums using rounding.

What mistake did Tasha make when calculating her sum?

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Explain the process of rounding numbers to assess the reasonableness of an addition problem.

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