12-gon Puzzle Challenge II
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 [...]
12-gon Puzzle Challenge I
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 [...]
A motivation for fractions: is it fair?
I was asked last week to teach a guest lesson for 3rd graders on fractions using Everyday Math. The book had some nice lessons, including one that involved [...]
Symmetry and Pattern Blocks
I had a great session the other day with two wonderful kids, age 5 and 7. After warming up with a quick game of Hex, we jumped into our activity for the hour: [...]