Question

Fill in the Blank.

$\left(31+36\right)+13=31+\left(\boxed{}+13\right).$

Answer 1

If, $a,b,\&c$ are three whole numbers, then $\left(a+b\right)+c=a+\left(b+c\right)$, This property is called the associative property of addition.

$\therefore \left(31+36\right)+13=31+\left(\boxed{36}+13\right).$