# Calculate the Greatest Common Factor or GCF of 669

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The instructions to find the GCF of 669 are the next:

## 1. Decompose all numbers into prime factors

669 | 3 |

223 | 223 |

1 |

## 2. Write all numbers as the product of its prime factors

Prime factors of 669 | = | 3 . 223 |

## 3. Choose the common prime factors with the lowest exponent

Common prime factors: 3 , 223

Common prime factors with the lowest exponent: 3^{1}, 223^{1}

## 4. Calculate the Greatest Common Factor or GCF

Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.

**GCF** = 3^{1}. 223^{1} = 669

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