Believe it or not, highway numbers actually make sense. Here's the logic behind odd and even routes, and why the system isn't ...

1. Fast and Slow Piles. This works well as a starting or closing activity. Students sort math fact cards into fast and slow piles. This visual way of tracking facts highlights which facts come ...

The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

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