Cards24 is a mathematical card game in which the goal is to get an end result of 24 by using the four open cards and joining them using basic math operations of addition, subtraction, multiplication and division. All the four cards have to be used only once while the operators can be used multiple times. Jack, Queen, King and Ace are 11,12,13 and 1 respectively. A round of game begins when you draw the four cards and ends when you have identified within your mind whether the four cards can produce a result of 24. You can choose to take the help of the game to check whether a result of 24 can be achieved and continue to think further if a solution exists, even before you see the actual solutions. This game is played worldwide among all age groups and can improve mathematical skills.

source : itunes.apple.com