When you are adding and subtracting decimals, there are two key things you need to do:

1) Line up your decimal points.

2) Fill in the decimals places, so there are the same amount in each question.

**e.g. 4.75 + 2.4**

**Step 1:** Set up the addition, taking care to line up your decimal points and add extra zeros where needed.

4.75 |

+ 2.40 |

**Step 2:** Complete the addition as normal.

4.75 |

+ 2.40 |

7.15 |

**e.g. 3.845 - 0.48**

**Step 1:** Set up the subtraction, taking care to line up your decimal points and add extra zeros.

3.845 |

- 0.480 |

**Step 2:** Complete the subtraction as normal.

3.845 |

- 0.480 |

3.365 |

Before you start this activity, grab a pen and paper so you can write out your own addition and subtraction sums to work them out.