What is the Least Common Multiple of 381 and 393?

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 381 and 393 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 381 and 393, than apply into the LCM equation.

GCF(381,393) = 3
LCM(381,393) = ( 381 × 393) / 3
LCM(381,393) = 149733 / 3
LCM(381,393) = 49911

Least Common Multiple (LCM) of 381 and 393 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 381 and 393. First we will calculate the prime factors of 381 and 393.

Prime Factorization of 381

Prime Factorization of 393

Now multiplying the highest exponent prime factors to calculate the LCM of 381 and 393.

LCM(381,393) = 3¹ × 127¹ × 131¹
LCM(381,393) = 49911