I’ve been immersed in puzzle and lesson creation lately, and I thought I should take advantage and throw some of them out here on the blog. Please take, [...]

I was just observing a third grade class learning/reviewing basic fraction to decimal conversion, and I overheard a great remark. A girl, reading a word [...]

I recently posted this interesting inversion problem: The question is this: in mod n, how many functions f(x)= ax +b are their own inverses? For example, the [...]

I’ve been exploring a new problem with a couple of students recently that I find incredibly compelling, and I thought I’d mention it here. The main idea is [...]

Here are the questions folks contributed: From Paul: Why on earth would you break the symmetry by using a parallelogram instead of two triangles in the [...]

Here are three dodecahedra dodecagons (that is, 12-gons) a group of students I work with put together out of pattern blocks. I have some thoughts about [...]