Greatest Common Factors and Least Common Multiples

When you find all the factors of two or more numbers, and you find some factors that sre the same ("common"), the largest of those common factors is the GREATEST COMMON FACTOR (GCF).

List the factors of 8: 1, 2, 4, 8

List the factors of 12: 1, 2, 3, 4, 6, 12

List the common factors: 1, 2, 4

What is the GCF? 4

A MULTIPLE of a number is the product of the number multiplied by a whole number. (6x1), (6x2), (6x3,) (6x4), (6x5), (6x6), (6x7), (6x8)....

(SKIP COUNTING)

A number has ENDLESS multiples. The multiples of 6 are:

6, 12, 18, 24, 30, 36, 42, 48......... (The list NEVER ENDS)

List the multiples of 2:

2, 4, 6, 8, 10, 12, 14, 16, 18......... (Never ends)

List the multiples of 3:

3, 6, 9, 12, 15, 18, 21, 24..........(Never ends)

Common multiples: 6, 12, 18,

LCM: 6