# Calculate the Greatest Common Factor or GCF of 1128

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The instructions to find the GCF of 1128 are the next:

## 1. Decompose all numbers into prime factors

1128 | 2 |

564 | 2 |

282 | 2 |

141 | 3 |

47 | 47 |

1 |

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

Prime factors of 1128 | = | 2^{3} . 3 . 47 |

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

Common prime factors: 2 , 3 , 47

Common prime factors with the lowest exponent: 2^{3}, 3^{1}, 47^{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^{3}. 3^{1}. 47^{1} = 1128

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