Idea 8of 22Builds onA double-bar graph compares two groups
A stacked bar shows parts of a whole
How can one bar show a whole and its parts?
Today you'll discover
- what the whole bar shows
- what each part shows
- how the parts add up
Think firstEach bar is one class, split into parts
How many students are in Room 14 altogether?
Decide first, then press Next. Read the top of the whole bar first.
A stacked-bar graph of how we get to school: one bar for each of Rooms 12, 14 and 16, each split into a plain walk part, a striped bus part and a dotted car part. Room 14's parts are 6, 12 and 8, making 26. The totals 24, 26 and 22 are printed above the bars. The last step shows pizza votes, stacked by room.
See the whole ideathe big idea and the key word, in one place
The big idea
In a stacked-bar graph, each bar is a whole, split into parts that add up to it.
Good forShowing the parts of each whole and the total at once: how each class travels, and how big each class is.
Easy to get wrongThe parts must add up to the whole bar. If they don't, the graph has a mistake in it.
Key word
- stacked-bar graph
- a bar graph where each bar is a whole, cut into parts stacked one on top of another
Ready to use it?
- Read the total of a stacked bar.
- Add the parts of a stacked bar.