Description
The purpose of this material is to introduce the child to the unit combinations of subtraction of numbers 1 to 9. The material incudes: a 9-compartment wooden box with 10 sets of Colored Bead Stairs 1-9; a 2-compartments wooden box with 1 set of Black and White Bead Stairs and 20 Golden Bars of 10; 1 wooden box containing 5 sets of Negative Bead Stairs 1-9. The 3 boxes fit neatly into a beechwood tray.
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