1. The model that involves addition
2. The model that involves subtraction
3. The model that involves comparison
4. The model that involves two items with a difference
5. The model that involves multiples
6. The model that involves multiples and difference
7. The model that involves creating a whole
8. The model that involves sharing
9. The model that involves fractions
10. The model that involves ratio
11. The model that involves comparison of fractions