What is the Least Common Multiple of 1538 and 1558?

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 1538 and 1558 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1538 and 1558, than apply into the LCM equation.

GCF(1538,1558) = 2
LCM(1538,1558) = ( 1538 × 1558) / 2
LCM(1538,1558) = 2396204 / 2
LCM(1538,1558) = 1198102

Least Common Multiple (LCM) of 1538 and 1558 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1538 and 1558. First we will calculate the prime factors of 1538 and 1558.

Prime Factorization of 1538

Prime Factorization of 1558

Now multiplying the highest exponent prime factors to calculate the LCM of 1538 and 1558.

LCM(1538,1558) = 2¹ × 769¹ × 19¹ × 41¹
LCM(1538,1558) = 1198102