Did you play Mancala when you were a child? My siblings and I played all the time! I had forgotten all about it until recently stumbling upon it on Amazon while looking for Christmas gifts. I ended up buying it for my 6-year-old, and I think we’ve played already a bazillion times. Even my 4-year-old loves it. It’s such a simple game which has been around for generations and played all across the planet (some people say it’s the oldest game in the world).
There are all sorts of boards you can buy, from simple folding ones to nicer bamboo sets. You can even make your own with an empty egg carton (how cool!) and use simple rocks or pebbles just like they did ages ago. Either way, the game is great fun for all ages (probably 4+) and encourages good counting skills.