# Calculate the Greatest Common Factor or GCF of 1228

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The instructions to find the GCF of 1228 are the next:

## 1. Decompose all numbers into prime factors

1228 | 2 |

614 | 2 |

307 | 307 |

1 |

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

Prime factors of 1228 | = | 2^{2} . 307 |

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

Common prime factors: 2 , 307

Common prime factors with the lowest exponent: 2^{2}, 307^{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** = 2^{2}. 307^{1} = 1228

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