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

Question

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

anonymous · Answer

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

anonymous · Answer

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