What is the Least Common Multiple of 189 and 198?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 189 and 198 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 189 and 198, than apply into the LCM equation.

GCF(189,198) = 9
LCM(189,198) = ( 189 × 198) / 9
LCM(189,198) = 37422 / 9
LCM(189,198) = 4158

Least Common Multiple (LCM) of 189 and 198 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 189 and 198. First we will calculate the prime factors of 189 and 198.

Prime Factorization of 189

Prime Factorization of 198

Now multiplying the highest exponent prime factors to calculate the LCM of 189 and 198.

LCM(189,198) = 3³ × 7¹ × 2¹ × 11¹
LCM(189,198) = 4158