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What is the Least Common Multiple of 642 and 662?

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 642 and 662 is 212502.

LCM(642,662) = 212502

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Least Common Multiple of 642 and 662 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 642 and 662, than apply into the LCM equation.

GCF(642,662) = 2
LCM(642,662) = ( 642 × 662) / 2
LCM(642,662) = 425004 / 2
LCM(642,662) = 212502

Least Common Multiple (LCM) of 642 and 662 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 642 and 662. First we will calculate the prime factors of 642 and 662.

Prime Factorization of 642

Prime factors of 642 are 2, 3, 107. Prime factorization of 642 in exponential form is:

642 = 21 × 31 × 1071

Prime Factorization of 662

Prime factors of 662 are 2, 331. Prime factorization of 662 in exponential form is:

662 = 21 × 3311

Now multiplying the highest exponent prime factors to calculate the LCM of 642 and 662.

LCM(642,662) = 21 × 31 × 1071 × 3311
LCM(642,662) = 212502