What is the Least Common Multiple of 39980 and 39992?

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 39980 and 39992 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 39980 and 39992, than apply into the LCM equation.

GCF(39980,39992) = 4
LCM(39980,39992) = ( 39980 × 39992) / 4
LCM(39980,39992) = 1598880160 / 4
LCM(39980,39992) = 399720040

Least Common Multiple (LCM) of 39980 and 39992 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 39980 and 39992. First we will calculate the prime factors of 39980 and 39992.

Prime Factorization of 39980

Prime Factorization of 39992

Now multiplying the highest exponent prime factors to calculate the LCM of 39980 and 39992.

LCM(39980,39992) = 2³ × 5¹ × 1999¹ × 4999¹
LCM(39980,39992) = 399720040