Since both 1/2 and 2/5 have different denominators, you have to find fractions equivalent to them, (using multiples) that both have the same denominator. It's when 1/2 is equal to 2/4.
1/2=5/10
2/5=4/10
then solve with your "new" fractions with more ease.
5/10+4/10=9/10
If possible, simplify, but 9/10ths is already in it's simplest form.
Answer: 9/10
