** Abacus Activities
- The Chrisendave Exploration / Dave Jellicoe
- Some Learning Materials for a MAKE & TAKE Workshop
- Egg Carton Arithmetic
- Sorting Materials
- Hooked Frame
- Calendar Math
- Build a Simple Astrolabe
- The North Star and Latitude
- Slide-rule for Integers
- Buoyancy
- Multiplication as Repeated Addition