What is the Least Common Multiple of 9978 and 9990?

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 9978 and 9990 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 9978 and 9990, than apply into the LCM equation.

GCF(9978,9990) = 6
LCM(9978,9990) = ( 9978 × 9990) / 6
LCM(9978,9990) = 99680220 / 6
LCM(9978,9990) = 16613370

Least Common Multiple (LCM) of 9978 and 9990 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 9978 and 9990. First we will calculate the prime factors of 9978 and 9990.

Prime Factorization of 9978

Prime Factorization of 9990

Now multiplying the highest exponent prime factors to calculate the LCM of 9978 and 9990.

LCM(9978,9990) = 2¹ × 3³ × 1663¹ × 5¹ × 37¹
LCM(9978,9990) = 16613370