Each of these is not like the Others
Activity, Stage 1 – Object Properties
The setup.
Start with a group of four things with the following property: for each one of the things, the remaining three things have something in common that is not shared by the fourth.
Challenge each other to find groups with this property. Be flexible and allow for any reasonable explanation that seems to work.
Example.
The first item is a triangle, while the others are squares. The second has a hole, while the others are solid. The third is a lot smaller than the others. The fourth is blue, while the others are red.