Posted by **Kelly** on Tuesday, May 15, 2012 at 7:37pm.

Write an addition problem in which, when the addends are rounded to the nearest ten, the sum is 90. Then explain how you use estimation to solve the problem.

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March 24, 2017
Posted by **Kelly** on Tuesday, May 15, 2012 at 7:37pm.

Write an addition problem in which, when the addends are rounded to the nearest ten, the sum is 90. Then explain how you use estimation to solve the problem.

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