What is the Least Common Multiple of 428 and 445?

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 428 and 445 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 428 and 445, than apply into the LCM equation.

GCF(428,445) = 1
LCM(428,445) = ( 428 × 445) / 1
LCM(428,445) = 190460 / 1
LCM(428,445) = 190460

Least Common Multiple (LCM) of 428 and 445 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 428 and 445. First we will calculate the prime factors of 428 and 445.

Prime Factorization of 428

Prime Factorization of 445

Now multiplying the highest exponent prime factors to calculate the LCM of 428 and 445.

LCM(428,445) = 2² × 107¹ × 5¹ × 89¹
LCM(428,445) = 190460