Assessing the Reasonableness of Subtraction with Rounding

The video tutorial teaches how to assess the reasonableness of subtraction results by using rounding. It explains the concept of rounding numbers to the nearest place value to estimate and check if a calculated difference is reasonable. Two examples are provided: Stephanie's subtraction of 298 from 410, which is deemed unreasonable, and Chris' subtraction of 187,600 from 508,000, which is considered reasonable. The tutorial emphasizes understanding rounding errors and their impact on the reasonableness of results.

Explain why Chris' answer of 320,400 was considered reasonable despite being off by 20,000.

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What concept is used to determine whether to round up or down?

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