Keep the class on their toes and doing mental computation in this fast-paced series of games! Each card has a large "I have" numeral along with addition and subtraction questions at four levels of difficulty. One student reads, "I have 8. Who has 16 plus 5?" Be alert! If you have 21, it's your turn! Questions and answers continue until the cycle is complete. Includes 32 cards with answers from 1 to 32. For the whole class. This set highlights basic addition and subtraction facts and beyond, venturing into double-digit problems such as 30 - 12.