What is the Least Common Multiple of 620 and 635?

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 620 and 635 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 620 and 635, than apply into the LCM equation.

GCF(620,635) = 5
LCM(620,635) = ( 620 × 635) / 5
LCM(620,635) = 393700 / 5
LCM(620,635) = 78740

Least Common Multiple (LCM) of 620 and 635 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 620 and 635. First we will calculate the prime factors of 620 and 635.

Prime Factorization of 620

Prime Factorization of 635

Now multiplying the highest exponent prime factors to calculate the LCM of 620 and 635.

LCM(620,635) = 2² × 5¹ × 31¹ × 127¹
LCM(620,635) = 78740