# Cumulative Tables and Graphs

## Cumulative

Cumulative means "how much so far".

*Think of the word "accumulate" which means to gather together.*

To have cumulative totals, just **add up the values as you go**.

### Example: Jamie has earned this much in the last 6 months:

Month | Earned |
---|---|

March | $120 |

April | $50 |

May | $110 |

June | $100 |

July | $50 |

August | $20 |

To work out the cumulative totals, just add up as you go.

The first line is easy, the total earned so far is the same as Jamie earned that month:

Month | Earned | Cumulative |
---|---|---|

March | $120 | $120 |

But for April, the total earned so far is $120 + $50 = **$170** :

Month | Earned | Cumulative |
---|---|---|

March | $120 | $120 |

April | $50 | $170 |

And for May we continue to add up: $170 + $110 = **$280**

Month | Earned | Cumulative |
---|---|---|

March | $120 | $120 |

April | $50 | $170 |

May | $110 | $280 |

Do you see how we add the previous month's cumulative total to this month's earnings?

Here is the calculation for the rest:

- June is $280 + $100 =
**$380** - July is $380 + $50 =
**$430** - August is $430 + $20 =
**$450**

And this is the result

Month | Earned | Cumulative |
---|---|---|

March | $120 | $120 |

April | $50 | $170 |

May | $110 | $280 |

June | $100 | $380 |

July | $50 | $430 |

August | $20 | $450 |

The last cumulative total should match the total of all earnings:

**$450** is the last cumulative total ...

...
it is also the total of all earnings:

$120+$50+$110+$100+$50+$20 = **$450**

So we got it right.

So that's how to do it, **add up as you go down the list** and you will have cumulative totals.

We could also call it a "Running Total"

## Graphs

We can make cumulative graphs, too. Just plot each cumulative total:

Cumulative Bar Graph

Cumulative Line Graph