Your kid already knows the numbers, then you can actually start to cook it to the fact that they will need to add, multiply and divide. But as long as you want to distract him a little, and you try to check how he memorized the numbers, but Single to do this? All just go to the game. and ask him to join the queue all the numbers, it will connect and call them, the result will be drawing. Are you ready to experiment? Good luck.