Subtraction Strip Board

Using the Subtraction Strip Board. the child practices 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 1 set of blue strips used to subtract with (subtrahend). A set of red strips is included for further explorations. The 2 sets of strips are stored in wooden boxes with lid.