A lesson on estimation - add/subtract 4-digit numbers (3rd grade math)
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YouTubeMath Mammoth
A lesson on estimation - add/subtract 4-digit numbers (3rd grade math)
In this math lesson, we first estimate the result of addition / subtraction problems by rounding the numbers to the nearest hundred and adding/subtracting mentally. I also calculate the exact result, and then we compare. In the last exercise, the viewer gets to be a "teacher-detective" and to find out why the student's subtraction is incorrect ...
13.5K viewsNov 17, 2018
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