What is the Least Common Multiple of 915 and 921?

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 915 and 921 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 915 and 921, than apply into the LCM equation.

GCF(915,921) = 3
LCM(915,921) = ( 915 × 921) / 3
LCM(915,921) = 842715 / 3
LCM(915,921) = 280905

Least Common Multiple (LCM) of 915 and 921 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 915 and 921. First we will calculate the prime factors of 915 and 921.

Prime Factorization of 915

Prime Factorization of 921

Now multiplying the highest exponent prime factors to calculate the LCM of 915 and 921.

LCM(915,921) = 3¹ × 5¹ × 61¹ × 307¹
LCM(915,921) = 280905