Estimate the result using rounded numbers - 4th grade math

First in this lesson, we tackle a subtraction problem. I first estimate its result by rounding the numbers to the nearest hundred, then calculate the exact difference.

Secondly we solve a word problem without using exact calculations — just estimation. The task is to compare the cost of four piano lessons from two different piano teachers (Mathy my mascot wrote the problem!). Rounding the numbers to the nearest ten will help us find out which teacher is cheaper, and about how much Mathy the mammoth will save by choosing the cheaper teacher.

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See also

Rounding 4-digit numbers

Math Mammoth Grade 4 curriculum

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