What is the Least Common Multiple of 615 and 620?

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 615 and 620 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 615 and 620, than apply into the LCM equation.

GCF(615,620) = 5
LCM(615,620) = ( 615 × 620) / 5
LCM(615,620) = 381300 / 5
LCM(615,620) = 76260

Least Common Multiple (LCM) of 615 and 620 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 615 and 620. First we will calculate the prime factors of 615 and 620.

Prime Factorization of 615

Prime Factorization of 620

Now multiplying the highest exponent prime factors to calculate the LCM of 615 and 620.

LCM(615,620) = 3¹ × 5¹ × 41¹ × 2² × 31¹
LCM(615,620) = 76260