What is the Least Common Multiple of 905 and 920?

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 905 and 920 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 905 and 920, than apply into the LCM equation.

GCF(905,920) = 5
LCM(905,920) = ( 905 × 920) / 5
LCM(905,920) = 832600 / 5
LCM(905,920) = 166520

Least Common Multiple (LCM) of 905 and 920 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 905 and 920. First we will calculate the prime factors of 905 and 920.

Prime Factorization of 905

Prime Factorization of 920

Now multiplying the highest exponent prime factors to calculate the LCM of 905 and 920.

LCM(905,920) = 5¹ × 181¹ × 2³ × 23¹
LCM(905,920) = 166520