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...
The purpose of this material is to introduce the child to the unit combinations of subtraction. Includes: 1 box containing 5 sets of Negative Bead Stairs, 1 box containing 5...
The Subtraction Working Charts aid the child in practice and memorization of the subtraction combinations. Includes a control chart, 2 working charts and a box of wooden answer...