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A wooden tray containing 4 boxes with lids:
- 5 sets of 1-9 colored bead stairs
- 5 sets of 1-9 grey bead stairs
- 1-9 black and white bead stair
- 23 golden bead bars of ten
The purpose of this material is to:
- Introduce the child to the unit combination of subtraction.
- Teach how to subtract concrete representations of negative functions.
- Prepare for algebra (equal quantities of opposite sign eliminate each other).
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