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What is the Least Common Multiple of 422 and 438?

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 (LCM) of 422 and 438 is 92418.

LCM(422,438) = 92418

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Least Common Multiple of 422 and 438 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 422 and 438, than apply into the LCM equation.

GCF(422,438) = 2
LCM(422,438) = ( 422 × 438) / 2
LCM(422,438) = 184836 / 2
LCM(422,438) = 92418

Least Common Multiple (LCM) of 422 and 438 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 422 and 438. First we will calculate the prime factors of 422 and 438.

Prime Factorization of 422

Prime factors of 422 are 2, 211. Prime factorization of 422 in exponential form is:

422 = 21 × 2111

Prime Factorization of 438

Prime factors of 438 are 2, 3, 73. Prime factorization of 438 in exponential form is:

438 = 21 × 31 × 731

Now multiplying the highest exponent prime factors to calculate the LCM of 422 and 438.

LCM(422,438) = 21 × 2111 × 31 × 731
LCM(422,438) = 92418