Pi Day Sudoku
The Brainfreeze Pi Day Sudoku puzzle is free to use and distribute. Each row, column, and jigsaw region contains the first twelve digits of pi, including repeats: 3.14159265358.
Bracelets for Pi Day
As you know, on March 14, mathematics teachers around the world celebrate Pi Day! (3/14)
Patty paper confidence intervals
I use patty paper, which is thicker than tracing paper but still translucent, to illustrate the creation of confidence intervals. My experience has been that seeing is understanding.