### Which One Doesn't Belong?

With this instructional routine, teachers present four of something (like the 4 numbers to the right) and ask students to come up with reasons why each doesn't belong.

**Which One Doesn't Belong? (WODB) **is a collection of Numbers, Shapes, and Graphs to explore, curated by Mary Bourassa, inspired by the book Which One Doesn't Belong by Christopher Danielson. Start there or create your own!** **

You can find ideas on how to use WODB with adult students: Learning Through Classification