Question

How do I add and subtract fractions with different denominators? :)

Answer 1

1/3 + 1/5
First you find the least common multiple, in this example 15. This number will be your new denominator.
(1*a)/15 + (1*b)/15. a= 15/3 and b= 15/5, so a=5 and b = 3.
So, 1/3 + 1/5 = (1*5)/15 + (1*3)/15= 5/15 + 3/15 = 8/15.
You do the same with subtractions. If you don't understand my explanation, please, let me know, then I'll try again =)