This is a joint blog post by Kara Shane Colley, the author of My Hundred Friends that is soon to be published at Natural Math, and Dr. Maria Droujkova, the founder of Natural Math. We’ll be posting periodic updates about the book on the blog. I like how it’s funny and learnful. Elizabeth, 4th grade reader Maria: In My Hundred Friends by Kara Shane Colley, the math of factors and multiples is friendship. It’s a cozy little world, inviting readers to play and explore. Fr

This is a joint blog post by Kara Shane Colley, the author of My Hundred Friends soon to be published at Natural Math, and Dr. Maria Droujkova, the founder of Natural Math. Maria: In My Hundred Friends by Kara Shane Colley, the math of factors and multiples is friendship. It’s a cozy little world, inviting readers to play and explore. From April 27 to June 27, 2026, head to My Hundred Friends crowdfunding campaign to pre-order hardcover copies for your family or group, reser

First, a bit of background: I took AP Calculus as a senior in high school and I earned a 5. I then spent ~20 years working as a math...

I asked Rye to teach me how to draw a circle, but I pretended that I didn't know what a circle was. Here is our conversation: Me: Teach...

A while back, I assigned a puzzle about terminating and repeating decimals. As part of working on this puzzle, this led me down the road...

Have you ever noticed that some decimals terminate and that others repeat? a) Find six fractions, three that turn into terminating...