Learing by playing, that's fun! variant 1,2: Memory. Match the number card with the picture card showing excatly this number of items. In the second variant, use the plus card also. variant 3: Place the 12 number cards faceup on the table. Shuffle plus and minus cards into one stack. On your turn, draw a card from the stack and read one of the tasks on it to the next player, clockwise. If he can solve the task by pointing to the correct number card on the table, he gets the task card, otherwise the next player has a chance to solve it. Whoever gets to solve six tasks first is the winner!