In order to add or subtract fractions with
unlike denominators, a common denominator is needed. We
suggest the smallest common denominator be used. This common
multiple is known as the Least Common Multiple (LCM). In the
case of fractions, it is called the Least Common Denominator(LCD). |
In this example, both 36 and 72 are common
multiples. The LCM is 36. |