Montessori Subtraction Strip Board

The Montessori Subtraction Board helps a child understand basic subtraction, and prepares a child for more abstract math.

The set contains: a wooden board (12 squares by 18 squares) with the numerals 1-18 printed across the top; a wooden box contains 9 red wooden strips and 9 blue wooden strips both printed with the numerals 1 to 9; a wooden box contains 18 natural wooden strips of varying lengths