OpenStudy (anonymous):

follow principles of estimation to find an approximate value. round each number so that there is one nonzero digit do not find the exact value Estimate of SUM is 18+52+40+15+77 so should be 20+50+40+(10 or 20?)+80 i think the 15 should be rounded up to 20 just not 100% sure thanks in advance

3 years ago
OpenStudy (anonymous):

if it was me i would leave 15 as 15, it is easy to tack 5 on at the end

3 years ago
OpenStudy (anonymous):

it has to be a zero so that's why the answer has to be 10 or 20

3 years ago
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