If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Factors and multiples review

Review factors and multiples, and try some practice problems.

What is a factor?

A factor is a whole number that can divide evenly into another number.
The factors of 8 are: 1,2,4, and 8.
8÷1=8
8÷2=4
8÷4=2
8÷8=1
1,2,4, and 8 all divide evenly into 8.

Factor pairs

A factor pair is 2 whole numbers that can be multiplied to get a certain product.
The factor pairs of 8 are:
1 and 8 because 1×8=8
2 and 4 because 2×4=8
Want to learn more about finding factors? Check out this video.
Want more ways to think about factors and multiples? Check out this article.

Practice set 1: Finding factors

Problem 1A
Which of the following numbers is a factor of 78?
Choose 1 answer:

Want to try more problems like this? Check out this exercise.

What is a multiple?

A multiple is a number that results when we multiply one whole number by another whole number. The first four multiples of 3 are 3,6,9, and 12 because:
3×1=3
3×2=6
3×3=9
3×4=12
Some other multiples of 3 are 15,30 and 300.
3×5=15
3×10=30
3×100=300
We can never list all of the multiples of a number. In our example, 3 could be multiplied by an infinite number of numbers to find new multiples.

Identifying multiples

We can check to see if a number is a multiple of another number by seeing if it can be divided evenly by the number.
15 is a multiple of 3 because 15÷3=5.
17 is not a multiple of 3 because 17÷3=5 R 2.
Want to learn more about finding factors and multiples of a number? Check out this video.

Practice set 2: Finding multiples

Problem 2A
Which of the following numbers is a multiple of 9?
Choose 1 answer:

Want to try more problems like this? Check out this exercise.

Want to join the conversation?