## Download Finding Common Factors Between Two Whole Numbers Within 100

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## Definition:

Common factors are those that are found in both list of two whole numbers. When there is a presence of factor among two or more numbers, it is said to be a common factor.

## Summary:

- The Greatest Common Factor between two numbers is the largest number that is a factor of both numbers.
- And the Greatest Common Factor between lots of numbers, is the largest factor that all the numbers have in common.
- The Greatest Common Factor is the same as the Highest Common Factor, and the Greatest Common Divisor.
- It is often abbreviated to the GCF.
- If there are no other common factors, then the gcf is 1 (as 1 is a factor of all positive integers.)

## Example:

**What is the greatest common factor of 12 and 16?**

- Find all the factors of each number,
- Circle the common factors,
- Choose the greatest among of those.

Factors of 12: 1, 2, 3, 4, 6, 12

Factors of 16: 1, 2, 4, 8, 16

Common Factors: 1, 2, 4**4** is the Greatest Common Factor

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