Carroll Diagram
Data & Statistics · Year 1–Year 6
Drag the numbers into the grid. Every box has to be filled.
About the carroll
A two by two grid and a tray of ten numbers. The columns are one question and its opposite, the rows are another, and every number belongs in exactly one of the four boxes. Drag them in and check it when the class has finished.
It is the same sort as the Venn diagram drawn a different way, and it is worth doing both. A Venn leaves the numbers that fit neither loop in the space outside them, which a class can ignore without noticing. Here that is a box the same size as the other three, and somebody has to put something in it.
The opposites are written out properly: the other side of even is odd, and the other side of a multiple of 3 is not a multiple of 3. That is how a Carroll chart is labelled and it is half of what makes it worth drawing.
Check marks each number where it stands and says how many are in the right place. It is marking rather than a score: it comes off again, nothing counts up over a lesson and nothing is timed.
How to use it on your whiteboard
- 1Pick what the columns and the rows are asking on the toolbar.
- 2Drag a number off the tray into the box it belongs in. The top left box is the one where both are true.
- 3Drag a number again to move it, or drop it off the grid to put it back on the tray.
- 4Tap Check to mark the sort, and again to take the marking off.
Questions
- How is this different from a Venn diagram?
- It is the same sort with a different picture. The Carroll gives the things that fit neither question a box of their own, so a class has to decide about them rather than leaving them out.
- Which box is which?
- The columns are the first question and its opposite; the rows are the second and its opposite. So the top left is where both are true and the bottom right is where neither is.
- Is it scored?
- No. Check marks what is where and says how many are right. Nothing counts up over a lesson, nothing is timed, and the marking comes off again.