### Answers − Common Factors

1. | What are the common factors of 14 and 28? |

The factors of 14 are 1, 2, 7 and 14 | |

The factors of 28 are 1, 2, 4, 7, 14 and 28 | |

So the common factors 14 and 28 are 1, 2, 7 and 14 |

2. | What are the common factors of 16 and 32? |

The factors of 16 are 1, 2, 4, 8 and 16 | |

The factors of 32 are 1, 2, 4, 8, 16 and 32 | |

So the common factors of 16 and 32 are 1, 2, 4, 8 and 16 |

3. | What are the common factors of 18 and 40? |

The factors of 18 are 1, 2, 3, 6, 9 and 18 | |

The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40 | |

So the common factors of 18 and 40 are 1 and 2 |

4. | What are the common factors of 8 and 24? |

The factors of 8 are 1, 2, 4 and 8 | |

The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24 | |

So the common factors of 8 and 24 are 1, 2, 4 and 8 |

5. | What are the common factors of 15 and 18? |

The factors of 15 are 1, 3, 5 and 15 | |

The factors of 18 are 1, 2, 3, 6, 9 and 18 | |

So the common factors of 15 and 18 are 1 and 3 |

6. | What are the common factors of 20 and 32? |

The factors of 20 are 1, 2, 4, 5, 10 and 20 | |

The factors of 32 are 1, 2, 4, 8, 16 and 32 | |

So the common factors of 20 and 32 are 1, 2 and 4 |

7. | What are the common factors of 18 and 30? |

The factors of 18 are 1, 2, 3, 6, 9 and 18 | |

The factors of 30 are 1, 2, 3, 5, 6 , 10, 15 and 30 | |

So the common factors of 18 and 30 are 1, 2, 3 and 6 |

8. | What are the common factors of 15, 24 and 30? |

The factors of 15 are 1, 3, 5 and 15 | |

The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24 | |

The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30 | |

So the common factors of 15, 24 and 30 are 1 and 3 |

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