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 [...]
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 [...]
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 [...]
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 [...]