What is the Least Common Multiple of 1260 and 1268?

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 1260 and 1268 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1260 and 1268, than apply into the LCM equation.

GCF(1260,1268) = 4
LCM(1260,1268) = ( 1260 × 1268) / 4
LCM(1260,1268) = 1597680 / 4
LCM(1260,1268) = 399420

Least Common Multiple (LCM) of 1260 and 1268 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1260 and 1268. First we will calculate the prime factors of 1260 and 1268.

Prime Factorization of 1260

Prime Factorization of 1268

Now multiplying the highest exponent prime factors to calculate the LCM of 1260 and 1268.

LCM(1260,1268) = 2² × 3² × 5¹ × 7¹ × 317¹
LCM(1260,1268) = 399420