What is the Least Common Multiple of 1380 and 1389?

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 1380 and 1389 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1380 and 1389, than apply into the LCM equation.

GCF(1380,1389) = 3
LCM(1380,1389) = ( 1380 × 1389) / 3
LCM(1380,1389) = 1916820 / 3
LCM(1380,1389) = 638940

Least Common Multiple (LCM) of 1380 and 1389 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1380 and 1389. First we will calculate the prime factors of 1380 and 1389.

Prime Factorization of 1380

Prime Factorization of 1389

Now multiplying the highest exponent prime factors to calculate the LCM of 1380 and 1389.

LCM(1380,1389) = 2² × 3¹ × 5¹ × 23¹ × 463¹
LCM(1380,1389) = 638940