What is the Least Common Multiple of 648 and 668?

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 648 and 668 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 648 and 668, than apply into the LCM equation.

GCF(648,668) = 4
LCM(648,668) = ( 648 × 668) / 4
LCM(648,668) = 432864 / 4
LCM(648,668) = 108216

Least Common Multiple (LCM) of 648 and 668 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 648 and 668. First we will calculate the prime factors of 648 and 668.

Prime Factorization of 648

Prime Factorization of 668

Now multiplying the highest exponent prime factors to calculate the LCM of 648 and 668.

LCM(648,668) = 2³ × 3⁴ × 167¹
LCM(648,668) = 108216