What is the Least Common Multiple of 42240 and 42256?

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 42240 and 42256 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 42240 and 42256, than apply into the LCM equation.

GCF(42240,42256) = 16
LCM(42240,42256) = ( 42240 × 42256) / 16
LCM(42240,42256) = 1784893440 / 16
LCM(42240,42256) = 111555840

Least Common Multiple (LCM) of 42240 and 42256 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 42240 and 42256. First we will calculate the prime factors of 42240 and 42256.

Prime Factorization of 42240

Prime Factorization of 42256

Now multiplying the highest exponent prime factors to calculate the LCM of 42240 and 42256.

LCM(42240,42256) = 2⁸ × 3¹ × 5¹ × 11¹ × 19¹ × 139¹
LCM(42240,42256) = 111555840