What is the Least Common Multiple of 42105 and 42115?

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 42105 and 42115 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 42105 and 42115, than apply into the LCM equation.

GCF(42105,42115) = 5
LCM(42105,42115) = ( 42105 × 42115) / 5
LCM(42105,42115) = 1773252075 / 5
LCM(42105,42115) = 354650415

Least Common Multiple (LCM) of 42105 and 42115 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 42105 and 42115. First we will calculate the prime factors of 42105 and 42115.

Prime Factorization of 42105

Prime Factorization of 42115

Now multiplying the highest exponent prime factors to calculate the LCM of 42105 and 42115.

LCM(42105,42115) = 3¹ × 5¹ × 7¹ × 401¹ × 8423¹
LCM(42105,42115) = 354650415