The Least Common Multiple ( LCM ) is also referred to as the Lowest Common Multiple ( LCM ) and Least Common Divisor ( LCD) . For two integers a and b, denoted LCM(a,b), the LCM is the smallest positive integer that is evenly divisible by both a and b. For example, LCM(2,3) = 6 and LCM(6,10) = 30.

The greatest common factor (GCF or GCD or HCF) of a set of whole numbers is the largest positive integer that divides evenly into all numbers with zero remainder. For example, for the set of numbers 18, 30 and 42 the GCF = 6.

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Answer:

GCF(greatest common factor)

The greatest common factor (GCF) is a term used to describe the biggest number that can divide evenly into two or more numbers. Sometimes, this is also referred to as the greatest common divisor (GCD) or highest common factor

For example:

GCF of 2 and 4 by Listing Common Factors

There are 2 common factors of 2 and 4, that are 1 and 2. Therefore, the greatest common factor of 2 and 4 is 2.

LCD(least common denominator)

The least common denominator (LCD) of the given non-zero denominators is the smallest whole number that is divisible by each of the denominators. It can also be used to add fractions, subtract fractions or compare them.

For example:

4 and 7 have 28 and 56 in common BUT the LCM would be 28 since that's the LEAST common, or the smallest number that they would have in common.