What is the Least Common Multiple of 3990 and 3998?

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 3990 and 3998 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3990 and 3998, than apply into the LCM equation.

GCF(3990,3998) = 2
LCM(3990,3998) = ( 3990 × 3998) / 2
LCM(3990,3998) = 15952020 / 2
LCM(3990,3998) = 7976010

Least Common Multiple (LCM) of 3990 and 3998 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3990 and 3998. First we will calculate the prime factors of 3990 and 3998.

Prime Factorization of 3990

Prime Factorization of 3998

Now multiplying the highest exponent prime factors to calculate the LCM of 3990 and 3998.

LCM(3990,3998) = 2¹ × 3¹ × 5¹ × 7¹ × 19¹ × 1999¹
LCM(3990,3998) = 7976010