Question

How can you add 3/10 and 2/5 please explain

Answer 1

in order to add these fractions you would take 2/5 and make the denominator the same as 3/10 (10)
to do this you take 2/5 and turn it into 4/10 by multiplying it by two. now you can add.
3/10 + 4/10 = 7/10

your answer is 7/10