How do you do L C D in math in fractions?

Answer 1

If you need to do addition or subtraction of fractions with different denominators, just multiply the denominators to get a common denominator. For example, a third plus a quarter would be done this way: 3 x 4 = 12, so we know that both denominators can be converted into twelfths. One third is 4/12 (because you multiply both the numerator and the denominator by 4) and one quarter is 3/12 (because you multiply both the numerator and the denominator by 3) and then you can add 4/12 + 3/12 = 7/12.