Changing dissimilar fraction to similar fraction?

Answer 1

You need to get the denominators (the numbers on the bottom) the same. Eg.

2/3 + 1/5

I'd I can convert both to be the same type of fractions the sum is easy. By making them 15ths (by multiplying the denominators) this will work.

I need to convert 2/3 into 15ths - simply multiply top and bottom by 5

2/3 = 10/15

I now need to convert 1/5 into 15ths by multiplying top and bottom by 3

1/5 = 3/15

my sum is now 10/15 + 3/15 = 13/15