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Melvin estimated 645 + 322 by adding 600 + 300. Is his estimated sum an over or under estimate?

Ty

• 4th grade math help! -

I'd guess that his estimate is less than the original answer since 45 is more than 22.

• 4th grade math help! -

yes i would agree that is would be less than since he rounded down for both

• 4th grade math help! -

under estimate

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