Question

step by step on how to solve - 2/5 + 1/2

Answer 1

There are several methods. One of the is the so called butterfly method:

In our case, we have

$-\frac{2}{5}+\frac{1}{2}$

hence

hence, the answer is

$-\frac{2}{5}+\frac{1}{2}=\frac{1}{10}$