Question

add: -1 + 11 + -8 + -13 + -31 = \boxed{}

Explanation:

Step1: Group positive/negative terms

$(-1 - 8 - 13 - 31) + 11$

Step2: Calculate negative sum

$-1 - 8 - 13 - 31 = -53$

Step3: Add positive term

$-53 + 11$

Answer:

$-42$