Nim maths starter (primary)

Find included the nim maths starter, suitable for primary school.

Instructions:
Nim is a very old game that is usually played with stones or tokens. But it’s also a game that can be played with pen and paper.

1. Draw 1, 3, 5, and 7 marks (or tokens) in the shape of a pyramid as shown in the illustration.
2. The objective is to force your opponent to cross out the last remaining mark.
3. Players alternate turns crossing out as many marks as they wish on each turn. However, they can only cross out marks on one line per turn.
4. The person who crosses out the last remaining mark loses