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Sample Article
Superhero in Training
Thanks for Being Brave
Kudos to you for coming to this site and arriving at this sentence. That means you recognize the importance of asking students to think at higher levels in the math classroom as often as possible, and you’re willing to make the effort to learn how to do this better.
That’s what this whole site is about—helping you to let go of tired ways of presenting mathematics that in ...
Sample Problem
Snakes on a Plain
This is one of my favorite problems! I discovered it while flying back from Wichita where I had presented a workshop. I noticed the snaking rivers on the plains below and wondered about the mathematics. If I modeled the "snakes" with semicircles, would there be an ideal number of snakes that woul...
Course(s): Geometry
Difficulty: 3/5
Length: long
Topics: circles, pi, circumference, literal equations
Sample Puzzle
Two-Kids Problem
Let's say that when a child is born, the probability of it being a girl is 0.5.
Out of all the two-child families in the world, I have randomly selected one family that has a golden retriever named Waldo. One of the two children is a girl. What is the probability that the other one is a girl?