GAM Montessori Subtraction Strip Board
Using the Subtraction Strip Board, the child practises the equations of the subtraction tables 1-18. Natural wooden strips corresponding in length to the squares 1-18 are used to indicate the number to subtract from (minuend) and one set of blue strips used to subtract with (subtrahend). A set of red strips is included for further explorations. The two sets of strips are stored in wooden boxes with lid.
Age recommendation: 3-6yrs