Christopher Danielson

The following is an extended excerpt of a cover letter for Is It a Vehicle?, a book I have play-tested many hundreds of times in a wide range of situations over the last five-plus years and not yet found a publishing home for. I hope you enjoy the writing, and I...

To celebrate ten years of Math On-A-Stick, we built Minnesota's Largest Pattern Block Mosaic yesterday at the Minnesota State Fair. Careful study of this next image reveals 24 jaggedy "rows" of 7 large hexagons, totaling 168 regular hexagons (with a few more than...

Note: An earlier version of this post was part of the Talking Math with Your Kids newsletter. The provider I used for that newsletter ceased operating a while back, but I saved all of the content and will republish some of that writing here on the blog from time to...

I wrote about two competing theories recently. Each is an answer the question Why do you never see a square on the rectangle page of a shapes book for young children? That question stands in for lots of other specific questions, such as Why do counting books tend...

Why do you never see a square on the rectangle page of a shapes book for children? This is the sort of book I'm talking about. I asked this question of a colleague this summer. It turns out that my colleague and I have different answers to this question. I'll share...

I received this note recently: I teach 1st and I'm also in ... M.Ed program for K-6. I'd be interested in having you come to our class. Let me know if that's still possible this year. Can I make time to talk math with young children? Of course I can! Pretty soon,...

I am obsessed with this shape toy I saw in the gift shop at the Science Museum of Minnesota last week. Seen from above in the first photo, the triangle looks like a triangle. Seen obliquely, we notice that the triangle is embossed on a half-sphere, and so the sides...