The objective of the 24 Game is to make 24. One may accomplish this goal by adding, subtracting, multiplying and/or dividing numbers. All four numbers on a card must be used, but only once. There is at least one solution to every card. The 24 Game is designed to improve basic mathematics skills for grades 1 through 8. Cards are 4'' x 4'' for easy handling. A minimum of 192 challenges per box. Decks include a mix of easy-1 Dot, medium- 2 Dot, and tough- 3 Dot challenges. The new Primer Edition cards have a self-check feature on the reverse side of card, so students can check answers and see alternate solutions.