Handling Data - Carroll Diagrams

A Carroll Diagram is used to sort objects or numbers in a simple Yes/No way by using their properties to decide how they should be grouped together.

They are named after Lewis Carroll, the famous writer of 'Alice's Adventures in Wonderland', 'Through the Looking Glass' and 'The Jabberwocky'.

The usual format of a Carroll diagram is that of a table consisting of two rows and two columns to represent the different categories. Lets look at sorting the numbers 1 to 20 into odd, even, 10 or less and more than 10.



We simply take each number in turn and decide which box to put it in - 1 is odd and less than 10 so it goes in the top left - 18 is even and over 10 so it goes in the bottom right.


Practice with these worksheets

Carroll diagrams from Mathsblog

Fruit Likes and Dislikes and Pirates

from Primary Resources

CAT4 / 12 Pus papers