This page provides a brief overview of *highest common factor 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`"

Factors of `12` are `1,2,3,4,6,12` and factors of `18` are `1,2,3,6,18`. The common factors of these two numbers are `1,2,3,6`. What is the highest common factor for these two numbers?

- `1,2,3,6`
- `6`
- `6`
- `1`

The answer is "`6`"

**Highest Common Factor** : The highest factor in the common factors of two or more numbers is the highest common factor of those numbers.

What is the HCF of `2` and `4`?

- `2`
- `2`
- `4`

The answer is "`2`"

What is the HCF of `8` and `9`?

- `8`
- `9`
- `1`
- `1`

The answer is "`1`".

What is the HCF of `24` and `30`?

- `2`
- `3`
- `6`
- `6`

The answer is "`6`".

The factors of `24` are `1, 2, 3, 4, 6, 8, 12, 24`.

The factors of `30` are `1, 2, 3, 5, 6, 10, 15`.

The common factors are `1, 2, 3, 6`.

The highest value in common factors is `6`.

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