Question

Add.
–27 + 45

A. –72

B. –18

C. 18

D. 72

Answer 1

Imagine 45, as 15.

The difference between 15, and 7, is 8. So we know the second number is going to be 8.

In this case, that rules out both -72 and 72.

Now, 42 is greater than 27, so we know that answer is going to be positive, even tho there is an answer being subtracted.

Meaning the answer, is '18' or C