Count the number of mice before and after release (different spatial arrangements)
- Level 1: indicate whether the quantity is the same or not.
- Level 2: indicate if there are less, more or as many.
- Help from Serge: display of the starting quantity (dominoes). - Adjustable interval.

Skill worked: evaluate and compare collections of objects with digital or non-digital procedures (immediate perception, term-to-term correspondence, etc.)