What is the Least Common Multiple of 42420 and 42440?

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 42420 and 42440 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 42420 and 42440, than apply into the LCM equation.

GCF(42420,42440) = 20
LCM(42420,42440) = ( 42420 × 42440) / 20
LCM(42420,42440) = 1800304800 / 20
LCM(42420,42440) = 90015240

Least Common Multiple (LCM) of 42420 and 42440 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 42420 and 42440. First we will calculate the prime factors of 42420 and 42440.

Prime Factorization of 42420

Prime Factorization of 42440

Now multiplying the highest exponent prime factors to calculate the LCM of 42420 and 42440.

LCM(42420,42440) = 2³ × 3¹ × 5¹ × 7¹ × 101¹ × 1061¹
LCM(42420,42440) = 90015240