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Teaching how to estimate sums using place value with a step-by-step example on a whiteboard.

A whiteboard showing a math lesson on using place value to estimate a sum, with steps and an example addition problem (427 + 286) rounded to 400 + 300 = 700.

A whiteboard showing a math lesson on using place value to estimate a sum, with steps and an example addition problem (427 + 286) rounded to 400 + 300 = 700.

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