- Modeling - non-standard & standard problems
- 'SQUARE-ness' of Rectangles
- Squareness of Parallelograms
- 'EQUILATERAL-ness' of Triangles
- Sum of Circle Areas
- Erehwon Coinage
- Adult tickets & Child tickets
- Coffee Mixture Problem
- Coin problem workbench
- Meeting Up - on the road with Red & Blue
- Recovering from a long lunch
- combining rates
- A puzzling problem
- The Sliding Ladder Problem
- The Princess and the Key
- Horse on road and field
- Two Planets & A Sun - A Digital Triptych
- planetary orbits in two frames
- Keeping Pace - A Balanced Assessment Task
- Crowded-ness