Question

Fill in the blanks.

$-40+........=-45$

Answer 1

$-40+........=-45$

Let $x$ be the unknown number here.

So,

$\begin{array}{rcl}-40+x& =& -45\\ x& =& -45-(-40)\\ x& =& -45+40=-5\end{array}$

Hence, the answer is $-5$