What is the Least Common Multiple of 720 and 738?

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 720 and 738 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 720 and 738, than apply into the LCM equation.

GCF(720,738) = 18
LCM(720,738) = ( 720 × 738) / 18
LCM(720,738) = 531360 / 18
LCM(720,738) = 29520

Least Common Multiple (LCM) of 720 and 738 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 720 and 738. First we will calculate the prime factors of 720 and 738.

Prime Factorization of 720

Prime Factorization of 738

Now multiplying the highest exponent prime factors to calculate the LCM of 720 and 738.

LCM(720,738) = 2⁴ × 3² × 5¹ × 41¹
LCM(720,738) = 29520