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.
This lesson is meant for 4th grade math. Check out also my other 4th grade videos at http://www.mathmammoth.com/videos/grade_4/math_videos_4th_grade.php
Tagged under: 4th grade,math,estimation,rounded numbers,rounding,compare cost,estimate
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