What is #-42+ 57- 14+ 80#?

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Answer 1 · 2016-09-09T08:09:14

#81#

This is adding of integers. You can also think of it as moving up and down the number line.

Positive # rarr # move to the RIGHT
Negative #rarr# move to the LEFT

#-42+57-14+80#

I prefer to re-arrange the numbers to have all the positives first.

=#color(blue)(+57+80)color(red)(-42-14) " "larr# simplify separately first

=#color(blue)(137)color(red)(-56) " "larr# there are more positives.

=#81#