- Students spend a lot of time learning how to classify quadrilaterals throughout the years (see example below). But what if you asked them to do the same thing for hexagons? Suddenly, there's creativity, invention, and discovery! This seems like an awesome idea for a math circle or a school math class.

- His book entitled

*Which one doesn't belong?*(Amazon affiliate link here) also looks awesome. On each page there are four shapes, and any one of them could be the one that doesn't belong - so instead of finding the correct answer, it's all about explaining and justifying your reasoning. For example, in the cover image below, the bottom right could be the odd one out because it has 5 sides and the rest have 6. Or the top right shape, because it's the only one that's not convex. Can you think of criteria that make each of the two leftmost shapes not belong?

Clicking the image leads to an Amazon affiliate link |

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