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Worksheet 4 - The Highest Common Factor (HCF) and the Lowest Common Multiple (LCM) (Difficulty level: Easy) | ||||
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The Highest Common Factor (H.C.F.) of: | ||||

16 and 14 is ____ | 6 and 10 is ____ | 20 and 30 is ____ | 6 and 9 is ____ | 45 and 40 is ____ |

27 and 18 is ____ | 25 and 35 is ____ | 35 and 15 is ____ | 14 and 8 is ____ | 14 and 12 is ____ |

4 and 8 is ____ | 9 and 18 is ____ | 20 and 40 is ____ | 8 and 16 is ____ | 40 and 35 is ____ |

21 and 18 is ____ | 18 and 4 is ____ | 24 and 21 is ____ | 30 and 20 is ____ | 18 and 6 is ____ |

45 and 15 is ____ | 18 and 8 is ____ | 10 and 14 is ____ | 20 and 45 is ____ | 18 and 21 is ____ |

10 and 6 is ____ | 6 and 4 is ____ | 15 and 40 is ____ | 14 and 10 is ____ | 12 and 4 is ____ |

30 and 27 is ____ | 30 and 45 is ____ | 24 and 12 is ____ | 24 and 21 is ____ | 14 and 6 is ____ |

8 and 14 is ____ | 15 and 21 is ____ | 12 and 18 is ____ | 15 and 18 is ____ | 21 and 9 is ____ |

9 and 6 is ____ | 15 and 18 is ____ | 20 and 25 is ____ | 24 and 12 is ____ | 15 and 10 is ____ |

15 and 12 is ____ | 12 and 14 is ____ | 18 and 8 is ____ | 15 and 40 is ____ | 40 and 30 is ____ |

25 and 30 is ____ | 9 and 6 is ____ | 35 and 25 is ____ | 12 and 6 is ____ | 4 and 10 is ____ |

27 and 21 is ____ | 10 and 8 is ____ | 18 and 12 is ____ | 21 and 18 is ____ | 20 and 25 is ____ |

9 and 27 is ____ | 6 and 27 is ____ | 35 and 30 is ____ | 10 and 6 is ____ | 21 and 9 is ____ |

16 and 4 is ____ | 12 and 15 is ____ | 30 and 45 is ____ | 6 and 18 is ____ | 25 and 45 is ____ |

20 and 10 is ____ | 40 and 10 is ____ | 15 and 21 is ____ | 15 and 9 is ____ | 30 and 40 is ____ |

The Lowest Common Multiple (L.C.M.) of: | ||||

15 and 10 is ____ | 15 and 6 is ____ | 15 and 18 is ____ | 15 and 8 is ____ | 6 and 20 is ____ |

15 and 36 is ____ | 25 and 9 is ____ | 15 and 20 is ____ | 4 and 9 is ____ | 25 and 10 is ____ |

15 and 8 is ____ | 10 and 16 is ____ | 6 and 18 is ____ | 10 and 12 is ____ | 10 and 12 is ____ |

10 and 6 is ____ | 6 and 10 is ____ | 4 and 9 is ____ | 15 and 10 is ____ | 15 and 16 is ____ |

4 and 24 is ____ | 6 and 12 is ____ | 9 and 8 is ____ | 15 and 12 is ____ | 30 and 10 is ____ |

6 and 8 is ____ | 4 and 20 is ____ | 25 and 12 is ____ | 10 and 4 is ____ | 45 and 9 is ____ |

9 and 36 is ____ | 10 and 12 is ____ | 6 and 4 is ____ | 25 and 6 is ____ | 10 and 4 is ____ |

10 and 30 is ____ | 4 and 15 is ____ | 10 and 30 is ____ | 9 and 16 is ____ | 15 and 10 is ____ |

15 and 6 is ____ | 6 and 10 is ____ | 10 and 18 is ____ | 25 and 8 is ____ | 25 and 12 is ____ |

9 and 12 is ____ | 15 and 30 is ____ | 4 and 18 is ____ | 10 and 18 is ____ | 15 and 10 is ____ |

9 and 16 is ____ | 15 and 8 is ____ | 9 and 12 is ____ | 25 and 6 is ____ | 10 and 24 is ____ |

4 and 20 is ____ | 4 and 20 is ____ | 15 and 30 is ____ | 10 and 8 is ____ | 6 and 18 is ____ |

25 and 20 is ____ | 15 and 20 is ____ | 4 and 6 is ____ | 10 and 12 is ____ | 4 and 6 is ____ |

6 and 36 is ____ | 4 and 16 is ____ | 75 and 15 is ____ | 6 and 15 is ____ | 9 and 18 is ____ |

15 and 8 is ____ | 25 and 30 is ____ | 10 and 12 is ____ | 15 and 18 is ____ | 9 and 12 is ____ |

Copyright 2009 - Adam Malinowski. (Member of CAL, Statutory Licence Schemes)