Khan Academy

Description: Sal solves a 2-step estimation word problem. Created by Sal Khan. And the fact that we have the word "roughly" here means we don't need to get the exact answer. If it said roughly or estimate how many marbles each of his classmates will get, that says, hey, maybe we can round these numbers a little bit to make our calculations a little bit easier. Well, let's round everything to the nearest ten, and maybe that'll simplify things.

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