Lowest common denominator

From Simple English Wikipedia, the free encyclopedia

The lowest common denominator (also least common denominator and LCD) is the least common multiple of the denominators (bottom parts) of a group of fractions. It makes it easier to add, subtract, and compare fractions.

The LCD of and is 6. This is because and equal and . 6 is the smallest number that can be at the bottom of both of those fractions.

The same thing also works with variables: