Idea 8of 22Builds onCompare shares, not counts
Parts stacked in one bar
How can one bar show the parts and the whole?
Today you'll discover
- what a stacked-bar graph is
- what the key is for
- where to read the whole group
Think firstOne bar for each room, in pieces
How many students does Room 14's whole bar stand for?
Decide first, then press Next. Read the top of a bar for the whole group.
A stacked-bar graph with two bars on a scale from 0 to 25: Room 12's bar reaches 20 and Room 14's reaches 25, each split into walk, bus, car and bike pieces, with a key on the right. Then the counts appear inside the pieces. The last step shows Grade 4 and Grade 5's recess games: tag, soccer and swings.
See the whole ideathe big idea and the key word, in one place
The big idea
In a stacked-bar graph, each piece is a part and the whole bar is the group.
Room 14Walk 9 at the bottom, then bus 6, car 5 and bike 5 on top. The bar reaches 9 + 6 + 5 + 5 = 25.
Easy to get wrongKeep the pieces in the same order in every bar, or a reader cannot match them across bars.
Key words
- stacked-bar graph
- a graph where each bar is split into pieces stacked on top of each other, one piece per part of the group
- key
- the small box that says what each colour or piece of a graph stands for
Ready to use it?
- Read the whole group from a stacked bar.
- Use the key to name each piece.