How do you evaluate #-23+30#?

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Answer 1 · 2016-12-18T19:56:58

7

#-23+30# is the same as #+30-23 = 30-23#.

Then we can start by subtracting 10's.

#30-20=10#

Then we can subtract the 1's.

#0-3 = -3#

Then we can add the remainders of the 10's and 1's to find the answer.

#10 + -3#, when adding a negative number it is the same as subtracting it.

#10 -3 = 7#