I recently received this lovely email entitled Prime Climb Success Story. The thinking here is super interesting, in my opinion, and wonderfully idiosyncratic. [...]

This video follows up on the previous blog post, on understanding multiplication. Put in the time now and get this foundational understanding laid right.

What does “solve 3 x 8” mean? There are actually two crucial pieces of information to parse for this to mean anything. “x” means “groups of” First [...]

We’re in the final stretch of the Kickstarter campaign now! The last ten days will determine just how successful the campaign is. Keep spreading the [...]

Meditation on the Distributive Property In other news, I’ve been thinking about the distributive property. It’s usually summarized algebraically [...]

Our new lesson plan library is up in beta form. We’re not sharing it widely yet, but it’s getting close. Our goal is to have a collection of great problems [...]