What is the Least Common Multiple of 438 and 458?

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 438 and 458 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 438 and 458, than apply into the LCM equation.

GCF(438,458) = 2
LCM(438,458) = ( 438 × 458) / 2
LCM(438,458) = 200604 / 2
LCM(438,458) = 100302

Least Common Multiple (LCM) of 438 and 458 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 438 and 458. First we will calculate the prime factors of 438 and 458.

Prime Factorization of 438

Prime Factorization of 458

Now multiplying the highest exponent prime factors to calculate the LCM of 438 and 458.

LCM(438,458) = 2¹ × 3¹ × 73¹ × 229¹
LCM(438,458) = 100302