What is the Least Common Multiple of 320 and 324?

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 320 and 324 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 320 and 324, than apply into the LCM equation.

GCF(320,324) = 4
LCM(320,324) = ( 320 × 324) / 4
LCM(320,324) = 103680 / 4
LCM(320,324) = 25920

Least Common Multiple (LCM) of 320 and 324 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 320 and 324. First we will calculate the prime factors of 320 and 324.

Prime Factorization of 320

Prime Factorization of 324

Now multiplying the highest exponent prime factors to calculate the LCM of 320 and 324.

LCM(320,324) = 2⁶ × 5¹ × 3⁴
LCM(320,324) = 25920