Flash cards work well for a homemade matching game. Create a set of answer cards to go with the flash cards. Students match the answer cards with the corresponding flash cards. You can also play this game like the classic Memory or Concentration game. The cards are turned upside-down, with the players taking turns flipping over two cards at a time. The goal is to find the flash card and its answer.
Adapt this to any grade level by using addition, subtraction, multiplication or division!
