Subtraction Tracks teaches simple subtraction with visual examples. Children design their own game by connecting the track pieces and play by lifting the answer flap to see if they are correct. Contains 13 interchangeable cardboard rail track pieces, 3 accessories, 4 playing pieces, die and instruction guide. Children build their own board game, connecting track pieces any way they like. Choose a train and start on the start square, roll the die and move forward. Answer flaps on racetrack pieces and play by lifting the answer flap to see if they are correct. Ages 5+. WARNING: CHOKING HAZARD SMALL PARTS Not suitable for children under 3 years.