What is the Least Common Multiple of 646 and 660?
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 646 and 660 is 213180.
LCM(646,660) = 213180
Least Common Multiple of 646 and 660 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 646 and 660, than apply into the LCM equation.
GCF(646,660) = 2
LCM(646,660) = ( 646 × 660) / 2
LCM(646,660) = 426360 / 2
LCM(646,660) = 213180
Least Common Multiple (LCM) of 646 and 660 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 646 and 660. First we will calculate the prime factors of 646 and 660.
Prime Factorization of 646
Prime factors of 646 are 2, 17, 19. Prime factorization of 646 in exponential form is:
646 = 21 × 171 × 191
Prime Factorization of 660
Prime factors of 660 are 2, 3, 5, 11. Prime factorization of 660 in exponential form is:
660 = 22 × 31 × 51 × 111
Now multiplying the highest exponent prime factors to calculate the LCM of 646 and 660.
LCM(646,660) = 22 × 171 × 191 × 31 × 51 × 111
LCM(646,660) = 213180
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