What is the Least Common Multiple of 217 and 231?

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 217 and 231 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 217 and 231, than apply into the LCM equation.

GCF(217,231) = 7
LCM(217,231) = ( 217 × 231) / 7
LCM(217,231) = 50127 / 7
LCM(217,231) = 7161

Least Common Multiple (LCM) of 217 and 231 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 217 and 231. First we will calculate the prime factors of 217 and 231.

Prime Factorization of 217

Prime Factorization of 231

Now multiplying the highest exponent prime factors to calculate the LCM of 217 and 231.

LCM(217,231) = 7¹ × 31¹ × 3¹ × 11¹
LCM(217,231) = 7161