What is the Least Common Multiple of 642 and 647?
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 647 is 415374.
LCM(642,647) = 415374
Least Common Multiple of 642 and 647 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 647, than apply into the LCM equation.
GCF(642,647) = 1
LCM(642,647) = ( 642 × 647) / 1
LCM(642,647) = 415374 / 1
LCM(642,647) = 415374
Least Common Multiple (LCM) of 642 and 647 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 642 and 647. First we will calculate the prime factors of 642 and 647.
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 647
Prime factors of 647 are 647. Prime factorization of 647 in exponential form is:
647 = 6471
Now multiplying the highest exponent prime factors to calculate the LCM of 642 and 647.
LCM(642,647) = 21 × 31 × 1071 × 6471
LCM(642,647) = 415374
Related Least Common Multiples of 642
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Related Least Common Multiples of 647
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