The Least Common Multiple (LCM) of two or more numbers is the least number other than 0 that is a multiple of each.
2 = 2,4,6,8,10,12,14,16,18,20
4 = 4,8,12,16,20,24,28,32,36,40
Another method in finding the least common multiple is by using the prime factors.
Find the prime factors of 12 and 20 using the factor tree.
12 20
4 × 3 4 × 5
2 × 2 × 3 2 × 2 × 5
The prime factors of 12 = 2^2 × 3
The prime factors of 20 = 2^2 × 5
The common factor is 2^2.
