How do you find the answer of fractions with different denomators?

Answer 1

Well first of all you find the least common multiple of the denominators
ex:

3/5+ 2/9

List 5's multiples

5: 10 15 20 25 30 35 40 45 50 55 60 65 70

Then list 9's multiples

9: 18 27 36 45 54 63 72 81 90

Then what is the lowest number in the list that they have in common?

45!

So rename the denominators so that they say /45

Then what?

You find out what you multiply the first denominator by to get the new denominators

5 X 9 = 45

9 X 5 = 45 (because that's just how it is)

So then you have to multiply the numerator by the same number as you multiplied the denominator

So it would be

3 X 9 = 27 So the first fraction would be 27/45

and then it would be

2 X 5 = 10 So the second fraction would be 10/45

THEN ADD!

27/45 + 10/45 = 37/45