SAT Math Divisibility Rules

**Divisibility Rules from 2 to 13**

A number is divisible by: |
**If:** |

**2** |
The last digit is even (0, 2, 4, 6, or 8). |

**3** |
The sum of the digits is divisible by 3. |

**4** |
The number formed by the last two digits of the original number is divisible by 4. |

**5** |
The number ending in a 0 or a 5. |

**6** |
The number is divisible by both 2 and 3. |

**7** |
The last digit of the number is multiplied by 2 and subtracted from the rest of the number and the answer is either 0 or divisible by 7. |

**8** |
The last three digits form a number divisible by 8. |

**9** |
The sum of the digits is divisible by 9. |

**10** |
The last digit is 0 |

**11** |
You add every second digit and then subtract all other digits and the answer is zero or a multiple of 11. |

**12** |
The number is divisible by both 3 and 4. |

**13** |
You remove the last digit from the number, then subtract 9 times the deleted digit from the remaining number. If what is left is divisible by 13, then so is the original number. |

Hope these help!!;);)