What is the Least Common Multiple of 40 and 46?
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 40 and 46 is 920.
LCM(40,46) = 920
Least Common Multiple of 40 and 46 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 40 and 46, than apply into the LCM equation.
GCF(40,46) = 2
LCM(40,46) = ( 40 × 46) / 2
LCM(40,46) = 1840 / 2
LCM(40,46) = 920
Least Common Multiple (LCM) of 40 and 46 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 40 and 46. First we will calculate the prime factors of 40 and 46.
Prime Factorization of 40
Prime factors of 40 are 2, 5. Prime factorization of 40 in exponential form is:
40 = 23 × 51
Prime Factorization of 46
Prime factors of 46 are 2, 23. Prime factorization of 46 in exponential form is:
46 = 21 × 231
Now multiplying the highest exponent prime factors to calculate the LCM of 40 and 46.
LCM(40,46) = 23 × 51 × 231
LCM(40,46) = 920