Calculos: Mathematics Calculation Game (Kickstarter)
The Card Game
Xavier Wilain created the card game Calculos, which is based on quick, mental mathematics dealing with the four arithmetic operations: addition, subtraction, multiplication, and division. There is a mixed version that has all four arithmetic operations.
Players start with a card and try to find a calculation that matches any of the calculations on the center card.
For example, if the center card has:
2 × 5
3 × 6
5 × 5
4 × 4
If you have any of the calculations on your card, say 4 × 4, you shout "4 times 4 equals 16" and claim the card. The object is for find a calculation faster than their opponents.
Here is a video of the card game and how to play it: