The game is simple and easy to learn, can brain puzzle and improve the arithmetic skills, is a very useful activity. Playing with operations Age 9-15 Try to achieve this result : 24. Must use four numbers . You can use +, -, *, / and brackets ( ) . Exemple : 8,2,6,1 (8+1) * 2 + 6 or (8 / 2) * 6 / 1 and so on.