What is the Least Common Multiple of 210 and 220?

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 210 and 220 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 210 and 220, than apply into the LCM equation.

GCF(210,220) = 10
LCM(210,220) = ( 210 × 220) / 10
LCM(210,220) = 46200 / 10
LCM(210,220) = 4620

Least Common Multiple (LCM) of 210 and 220 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 210 and 220. First we will calculate the prime factors of 210 and 220.

Prime Factorization of 210

Prime Factorization of 220

Now multiplying the highest exponent prime factors to calculate the LCM of 210 and 220.

LCM(210,220) = 2² × 3¹ × 5¹ × 7¹ × 11¹
LCM(210,220) = 4620