When we add or subtract two **fractions**, they must be the same type.

This means that they must have the same bottom number, which we call the **denominator**.

**Example**

Work out:

14 | - | 12 |

15 | 15 |

**Answer**

Both fractions have the same denominator. They are both 15ths.

14 | - | 12 |

15 | 15 |

We can simply subtract the top numbers to get 14 - 12 = 2.

= | 14 - 12 |

15 |

= | 2 |

15 |

Remember that the bottom number stays the same.