This page provides a brief overview of *common factors of two or more numbers*.

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What are the factors of `12` and `18`?

- `1,2,3,4,6,12` and `1,2,3,6,18`
- `1,2,3,4,6,12` and `1,2,3,6,18`
- Factors for two numbers are not defined.

The answer is "`1,2,3,4,6,12` and `1,2,3,6,18`"

Factors of `12` are `1,2,3,4,6,12` and factors of `18` are `1,2,3,6,18`. What are the common factors between these two?

- `1,2,3,6`
- `1,2,3,6`
- `1,2,3,4,6,12,18`
- `4,12`

The answer is "`1,2,3,6`"

Which of the following is a meaning for the word "common"?

- meet of find by chance
- one sharing and have a part of the other
- one sharing and have a part of the other

The answer is "one sharing and have a part of the other".

**Common Factors** : Factors common between two of more numbers are common factors of those numbers.

What are the common factors of `2` and `4`?

- no common factor
- `2`
- `2`

The answer is "`2`"

What are the common factors of `8` and `9`?

- no common factor other than `1`
- no common factor other than `1`
- `8` and `9`

The answer is "no common factor other than `1`"

What are the common factors of `8` and `12`?

- no common factor other than `1`
- `2, 4`
- `2, 4`

The answer is "`2, 4`".

The factors of `8` are `1, 2, 4, 8`.

The factors of `12` are `1, 2, 3, 4, 6, 12`.

The common numbers between the two list is `2` and `4`.

*slide-show version coming soon*