Math War

Here is a great idea from a homeschooling mama:
Math War with cards
Now play the classic game of War, but lay out 2 cards at a time. Add your two cards, and the player with the highest sum wins the turn. I have the student add my cards for me as well.
If your sums are equal, you have a battle: just lay two new cards on top of your first two, and winner takes all.
Since your deck will be smaller than with the usual War and since you each use two cards/turn, this game will usually end far more quickly than the neverending card game that we all dread.
For an older child you could use the whole deck, or practice subtraction or multiplication. To make it a little harder, you might try using 3 cards at a time. The possibilities are endless and easily tailored to almost any child’s level.