### Home > CC1 > Chapter 8 > Lesson 8.2.1 > Problem 8-77

The first four multiples of

What are the first six multiples of

? To find the first six multiples of

, you simply multiply by the numbers through separately and create a list of the products you find similar to the list written above. The first six multiples of

are , and . What are the first six multiples of

? The first six multiples of

are , and . What is the least common multiple of

and ? The Least Common Multiple of two or more integers is the lowest positive integer that is divisible by both (or all ) of the integers. For example, the multiples of

and are shown below in the table. is the Least Common Multiple because it is the smallest positive integer divisible by both and . Use this idea to find the least common multiple of and . 3

6

9

12

**15**18

5

10

**15**20

25

30

What is the greatest common factor of

and ? The Greatest Common Factor of two or more integers is the greatest positive integer that is a factor of both (or all) of the integers. For example, the factors of

are , , , , and and the factors of are , , , , , and , so the Greatest Common Factor of and is . The factors of

are: , and . The factors of are: and . Can you find the greatest common factor now?