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Least common multiple (LCM)
A common multiple is a number that is a multiple of two or more numbers. The common multiples of 3 and 4 are 0, 12, 24, ....

The least common multiple (LCM) of two numbers is the smallest number (not zero) that is a multiple of both.
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Greatest common factor (GCF)
The greatest common factor, or GCF, is the greatest factor that divides two numbers. To find the GCF of two numbers:
1.) List the prime factors of each number.
2.) Multiply those factors both numbers have in common. If there are no common prime factors, the GCF is 1.
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