Anya and I came up with a new card game — sum war. It’s a bit like war, but you throw two cards. The person with the higher sum wins all of the cards & puts them on the bottom of their stack. Keep going until someone has all of the cards. There’s obviously lots of addition involved, but the game uses estimation too (I have a 5 and a 7, you have a 5 and a 9 … you win without actually adding anything).
We came up with a new card game today — something to practice adding and subtracting (and mathematical thinking). Deal x cards (we’ve had five and seven to start). The remaining cards are the ‘draw’ pile. Flip one card over. Try to come up with an equation using the cards in your hand that combine with the flipped card to make an equation. Aces are 1, jacks are 11, queens are 12, and kings are 13.
There’s a King up — you’ve got 2, 5, 8, 9, and Q. 12(Q) + 9 – 8 = 13(K). You select one of the cards in your equation to place on the top of the face-up pile. The next person then tries to create an equation using the card you laid down.
Zero is a little special — there’s a some card up, x. If you have two cards of the same value, y. X plus Y minus Y equals X … and you can discard one of the cards you used in your equation.
If you cannot form an equation, you draw a card. The game ends when the face-down pile is exhausted. Add the values of the cards in your hand, and the person with the lowest value hand wins. This means you probably want to discard the highest value card in your equation (unless there’s a strategy to having the card — if I have an equation with 5 and 10, but have another 10 in my hand … I might want to hold on to the ten because the two tens are a 0 and are a guaranteed play).