Idea 9of 22Builds onA stacked bar shows parts of a whole
Read one part of a stacked bar
How tall is a part that doesn't start at 0?
Today you'll discover
- where a middle part starts
- where it stops
- why top minus bottom works
Think firstRoom 14's striped part sits in the middle
How many Room 14 students take the bus?
Decide first, then press Next. Read both ends of the part, not just its top.
The stacked-bar graph of how we get to school, scale 0 to 28 by 2s. Room 14's striped bus part is ringed, with dashed lines from its bottom at 6 and its top at 18 across to the scale and the working 18 − 6 = 12 beside it. Then Room 12's dotted car part, from 18 to 24. The last step shows the stacked pizza votes.
See the whole ideathe big idea and the key word, in one place
The big idea
A part of a stacked bar is its top reading minus its bottom reading.
Easy to get wrongOnly the bottom part starts at 0. Every other part starts where the part under it stops.
Top − bottomRoom 14's bus part stops at 18 and starts at 6, so 18 − 6 = 12 students take the bus.
Key word
- segment
- one part of a stacked bar, from where it starts to where it stops
Ready to use it?
- Read one part of a stacked bar.
- Check that the parts add up to the whole.