NIM
Equipment: paper (to keep a tally of wins) and 15 objects such as counters, staws, popsicle sticks, rocks
How to play:
*Set up 3 rows of objects like in the picture (rows of 3, 5, and 7).
*Players take turns removing objects from any one of the rows.
*You can take however many objects you like from a row, but only from that row.
*The loser who is the person who is forced to take the last object.
*Keep a tally of who wins. Discuss strategies after a few games.
Taken from 20 Maths Games by www.kathleenamorris.com