Challenge your first grader to find the missing values in this worksheet. She'll need to employ her knowledge of addition and subtraction in order to solve these puzzles. Use the values of the cards in the outer rings (Remember, aces = 1, jacks = 11, queens = 12, and kings = 13.) to decide whether addition or subtraction was used. The value of the card in the center of each target is equal to the sum or difference of each line of cards in the outer rings. Some puzzles may have more than one possible answer!