The odd solid out

💡 How it plays and why it helps

Many people expect the odd one out to be the odd color. The odd solid out, a Kindergarten game, takes that shortcut away: the four solids on a card all wear different colors. Three share a shape, such as cones, cubes, spheres or rectangular prisms, and one does not. Your child taps the one with a different shape. Five cards make a round, the instruction is read aloud, and every answer is checked and explained: it is a pyramid; the other three are cones.

Sorting by shape while ignoring color is classifying by one attribute, the skill behind every shape family. The hint says it plainly: look at the shape, not the color. Spheres around a cylinder are easy. Cones around a pyramid are not, since both rise to a point.

Hunting for the color that stands out is a strong habit, and here every solid has its own color, so the habit only works by luck. Cover the colors with your words: "Forget the paint. Which three are the same shape?" Praise the switch of focus: "You looked past the colors."