What is the Least Common Multiple of 117 and 221?

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 117 and 221 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 117 and 221, than apply into the LCM equation.

GCF(117,221) = 13
LCM(117,221) = ( 117 × 221) / 13
LCM(117,221) = 25857 / 13
LCM(117,221) = 1989

Least Common Multiple (LCM) of 117 and 221 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 117 and 221. First we will calculate the prime factors of 117 and 221.

Prime Factorization of 117

Prime Factorization of 221

Now multiplying the highest exponent prime factors to calculate the LCM of 117 and 221.

LCM(117,221) = 3² × 13¹ × 17¹
LCM(117,221) = 1989