What is one half plus two fifth

1/2+2/5

First we need to find a common denominator in this case it's 10. In order to change the denominators we need to multiply. 1/2*5/5=5/10

2/5*2/2=4/10

Now we can add our new fractions

5/10+4/10=9/10

Your answer is 9/10 it can not be simplified.