What is the Least Common Multiple of 18 and 320?

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 18 and 320 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 18 and 320, than apply into the LCM equation.

GCF(18,320) = 2
LCM(18,320) = ( 18 × 320) / 2
LCM(18,320) = 5760 / 2
LCM(18,320) = 2880

Least Common Multiple (LCM) of 18 and 320 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 18 and 320. First we will calculate the prime factors of 18 and 320.

Prime Factorization of 18

Prime Factorization of 320

Now multiplying the highest exponent prime factors to calculate the LCM of 18 and 320.

LCM(18,320) = 2⁶ × 3² × 5¹
LCM(18,320) = 2880