What is the Least Common Multiple of 105 and 115?

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 105 and 115 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 105 and 115, than apply into the LCM equation.

GCF(105,115) = 5
LCM(105,115) = ( 105 × 115) / 5
LCM(105,115) = 12075 / 5
LCM(105,115) = 2415

Least Common Multiple (LCM) of 105 and 115 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 105 and 115. First we will calculate the prime factors of 105 and 115.

Prime Factorization of 105

Prime Factorization of 115

Now multiplying the highest exponent prime factors to calculate the LCM of 105 and 115.

LCM(105,115) = 3¹ × 5¹ × 7¹ × 23¹
LCM(105,115) = 2415