Melissa & Doug Math Gears - SubtractionA pocket-sized interactive book with a gadget-like look and feel to help teach subtraction factsTurn the wheel to show a math problem, solve it, then lift the flap to check the answerIncludes “fun facts” about numbers and mathA sturdy, interactive teaching toolMakes a great gift for 4- to 7-year-olds, for hands-on, screen-free play
