Subtraction War: Each player has a stack. QK = 10; A = 1. Players take turns flipping over 2 cards from their piles. They read their number sentences, (e.g., 5 -2=3 & 7-2=5). The player with the larger answer wins all the cards. In the event of war (same answer), players each draw four cards and add them together. The largest sum wins.