What is the Least Common Multiple of 981 and 987?

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 981 and 987 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 981 and 987, than apply into the LCM equation.

GCF(981,987) = 3
LCM(981,987) = ( 981 × 987) / 3
LCM(981,987) = 968247 / 3
LCM(981,987) = 322749

Least Common Multiple (LCM) of 981 and 987 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 981 and 987. First we will calculate the prime factors of 981 and 987.

Prime Factorization of 981

Prime Factorization of 987

Now multiplying the highest exponent prime factors to calculate the LCM of 981 and 987.

LCM(981,987) = 3² × 109¹ × 7¹ × 47¹
LCM(981,987) = 322749