# 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