What is the Least Common Multiple of 640 and 651?
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 640 and 651 is 416640.
LCM(640,651) = 416640
Least Common Multiple of 640 and 651 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 640 and 651, than apply into the LCM equation.
GCF(640,651) = 1
LCM(640,651) = ( 640 × 651) / 1
LCM(640,651) = 416640 / 1
LCM(640,651) = 416640
Least Common Multiple (LCM) of 640 and 651 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 640 and 651. First we will calculate the prime factors of 640 and 651.
Prime Factorization of 640
Prime factors of 640 are 2, 5. Prime factorization of 640 in exponential form is:
640 = 27 × 51
Prime Factorization of 651
Prime factors of 651 are 3, 7, 31. Prime factorization of 651 in exponential form is:
651 = 31 × 71 × 311
Now multiplying the highest exponent prime factors to calculate the LCM of 640 and 651.
LCM(640,651) = 27 × 51 × 31 × 71 × 311
LCM(640,651) = 416640
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