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A matter of justice
There should be no doubt that racist ideas are bankrupt, and racist policy is unjust, that injustice toward any of us hurts all of us.
Understanding one-digit multiplication video
This video follows up on the previous blog post, on understanding multiplication. Put in the time now and get this foundational understanding laid right.
Understanding Multiplication Part 1
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 off, the [...]
Understanding subtraction part 2: multi-digit subtraction
I posted a little while ago about the importance of representations in subtraction. Today, I’m sharing a followup video on how to extend that understanding of fractions to [...]
A math game with its own theme song?!
A teacher named Mark Esch emailed me recently to ask about using one of our classroom games, Horseshoes, in a movie he wanted to make. When he sent it to me, I was blown away. It’s fun, and does a great job explaining the game. But [...]
A meditation on commutativity of multiplication
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 word, and hopefully we’ll get to 4x of our campaign target, hit all the [...]
Free printable Tiny Polka Dot starter deck
I recently committed to donate up to 1000 Tiny Polka Dot games if people could help us find good homes for them. Within four hours of a mass email going out, 359 people had filled [...]
Subtraction Part 1: Representations
In a recent blog post I talked about the importance of starting from where things make sense. This may be one of the best ways to help your kids with math at home. If you [...]
A Meditation on the Distributive Property
Meditation on the Distributive Property In other news, I’ve been thinking about the distributive property. It’s usually summarized algebraically as: a x (b + c) = (a x b) + (a x c) A more general formulation is the old [...]
MULTIPLICATION BY HEART: Visual Flash Cards… Kickstarter now live!
I’d always thought flash cards would be one of those things I’d never do. But at some point, I realized that the problem wasn’t the genre, it was the execution. Flash cards were either context-free or cluttered with [...]
Sidewalk Math Challenge
News: A new Kickstarter next week Many of you may know our games, Tiny Polka Dot and Prime Climb. Both were originally launched on kickstarter.com. And coming next week, we’re going to have a new campaign, for a new product that has [...]
Math Conversations at Home – ask “how many ways”
In the last post I gave an overview of ideas to help have productive and joyful math conversations at home. Now let’s drill down on one of those ideas. The concept is [...]