Algebra cards: Find a value for x and/or y which, when used with the other numbers on the card, can make 24. You can add, subtract, multiply, and/or divide. Use all four numbers, but use each number only once. Exponent cards: Same as Single Digits Math 24 game except that you must also use one and only one exponential operation (square, cube, square root, cube root). Example: Given the four numbers 1, 10, 8, 1. Then 10 - 1 = 9. The square root of 9 is 3. Then 3 x 8 is 24. Then 24 x 1 = 24.