Definitions

• LCM (least common multiple): smallest multiple amongst several numbers or variables

EXAMPLE

Numbers: 10, 20

Factors for each number: 10 = 5 * 2, 20 = 5 * 2 * 2

Minimum factors divisible for all numbers = 5, 2, 2

Multiply factors together to get the LCM = 5 * 2 * 2 = 20

• LCD (least common denominator): smallest common denominator for several fractions. It is used to add/subtract fractions

EXAMPLE

• Numbers = 1/5 & 1/2 => LCD = 10