Step 1: Find the Greatest Common Factor of 12, 20 initially. Greatest Common Factor is the largest integer by which both the numbers can be divided. The GCF of 12, 20 is 4. Simply use the GCF obtained in the formula to find the Least Common Multiple i.e. LCM (a,b) =a*b/GCF (a,b) Substitute the inputs in the formula and you will get as under.. Least Common Multiple (LCM) of 12 and 20 with Primes. Least common multiple can be found by multiplying the highest exponent prime factors of 12 and 20. First we will calculate the prime factors of 12 and 20. Prime Factorization of 12. Prime factors of 12 are 2, 3.

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The instructions to find the LCM of 12 and 20 are the next: 1. Decompose all numbers into prime factors. 2. Write all numbers as the product of its prime factors. 3. Choose the common and uncommon prime factors with the greatest exponent. Common prime factors: 2. Common prime factors with the greatest exponent: 2 2.. Refer to the link for details on how to determine the greatest common divisor. Given LCM (a, b), the procedure for finding the LCM using GCF is to divide the product of the numbers a and b by their GCF, i.e. (a × b)/GCF (a,b). When trying to determine the LCM of more than two numbers, for example LCM (a, b, c) find the LCM of a and b where the.