What is the Least Common Multiple of 12640 and 12660?

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 12640 and 12660 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 12640 and 12660, than apply into the LCM equation.

GCF(12640,12660) = 20
LCM(12640,12660) = ( 12640 × 12660) / 20
LCM(12640,12660) = 160022400 / 20
LCM(12640,12660) = 8001120

Least Common Multiple (LCM) of 12640 and 12660 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 12640 and 12660. First we will calculate the prime factors of 12640 and 12660.

Prime Factorization of 12640

Prime Factorization of 12660

Now multiplying the highest exponent prime factors to calculate the LCM of 12640 and 12660.

LCM(12640,12660) = 2⁵ × 5¹ × 79¹ × 3¹ × 211¹
LCM(12640,12660) = 8001120