Subtraction Strip Board

For parents

The subtraction strip board is how Montessori children commit the subtraction facts to memory after learning the addition facts. Your child sets the cover strip to the starting number, lays a blue strip to take an amount away, and reads the answer right off the board — then records the fact on paper. Because the board always shows the true answer, your child checks their own work without needing you to grade it. This steady, self-corrected practice prepares them for quick mental subtraction and for column arithmetic with borrowing.

Make the real thing

• Addition & Subtraction Strip Boards — Both fact-memorization strip boards at true size — each board tapes together from two halves, with the full set of blue, red, and natural strips.2 boards (2 pages each, taped) + 35 strips (9 blue, 9 red, 17 natural)