What is the Least Common Multiple of 642 and 657?
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 657 is 140598.
LCM(642,657) = 140598
Least Common Multiple of 642 and 657 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 657, than apply into the LCM equation.
GCF(642,657) = 3
LCM(642,657) = ( 642 × 657) / 3
LCM(642,657) = 421794 / 3
LCM(642,657) = 140598
Least Common Multiple (LCM) of 642 and 657 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 642 and 657. First we will calculate the prime factors of 642 and 657.
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 657
Prime factors of 657 are 3, 73. Prime factorization of 657 in exponential form is:
657 = 32 × 731
Now multiplying the highest exponent prime factors to calculate the LCM of 642 and 657.
LCM(642,657) = 21 × 32 × 1071 × 731
LCM(642,657) = 140598
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