Two decades ago, the mathematician Moon Duchin spent her summers teaching geometry at Mathcamp, a program for mathematically talented teens. Campers contemplated notions such as how to prove whether a ...

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 ...

First” rule says that you must have sufficient income to cover your must-pay living expenses before you do any discretionary spending. Find out if it’s right for you.

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We've been studying them for millennia, so how far have we come?