What is the Least Common Multiple of 1998 and 2015?

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 1998 and 2015 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1998 and 2015, than apply into the LCM equation.

GCF(1998,2015) = 1
LCM(1998,2015) = ( 1998 × 2015) / 1
LCM(1998,2015) = 4025970 / 1
LCM(1998,2015) = 4025970

Least Common Multiple (LCM) of 1998 and 2015 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1998 and 2015. First we will calculate the prime factors of 1998 and 2015.

Prime Factorization of 1998

Prime Factorization of 2015

Now multiplying the highest exponent prime factors to calculate the LCM of 1998 and 2015.

LCM(1998,2015) = 2¹ × 3³ × 37¹ × 5¹ × 13¹ × 31¹
LCM(1998,2015) = 4025970