Can You Guess? game
You need three people and a deck of cards. Aces counts as one. Take out the face cards to make it easier. If you play with face cards, jacks are 11, queens are 12, and kings are 13.
To play: Two people hold a card up to their foreheads without looking at it. The third person says the product of the two numbers on the card. Person 1 can see Person 2's card so they can guess what they are holding as it's the missing factor. Whoever guesses their card first, gets both cards. Rotate for the next round so that everybody gets a turn to hold up cards and also to say the products. Whoever has the most cards at the end wins.
Parents can sign children up for these fun practice site.