We started 4nums.com in 2012 to promote the awesome 4numbers math game to the public. The game originated in China. Kids are given 4 numbers and they use + - x / to make 24. All our games, apps, downloadable PDF's are FREE at http://www.4nums.com !
Math is fun. Let kids play and learn at the same time!
IMO gold medalist
PhD in Engineering
all contents are at 4nums.com