What is the Least Common Multiple of 42000 and 42015?

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 42000 and 42015 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 42000 and 42015, than apply into the LCM equation.

GCF(42000,42015) = 15
LCM(42000,42015) = ( 42000 × 42015) / 15
LCM(42000,42015) = 1764630000 / 15
LCM(42000,42015) = 117642000

Least Common Multiple (LCM) of 42000 and 42015 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 42000 and 42015. First we will calculate the prime factors of 42000 and 42015.

Prime Factorization of 42000

Prime Factorization of 42015

Now multiplying the highest exponent prime factors to calculate the LCM of 42000 and 42015.

LCM(42000,42015) = 2⁴ × 3¹ × 5³ × 7¹ × 2801¹
LCM(42000,42015) = 117642000