The purpose of this material is to introduce the child to the unit combinations of subtraction.  It teaches how to subtract concrete representations of negative functions and prepares the child for algebra (equal quantities of opposite sign eliminate each other).

Includes: 

• 5 sets of 1-9 coloured bead stairs
• 5 sets of 1-9 grey bead stairs
• 1-9 black and white bead stair
• 23 golden bead bars of ten
• Wooden tray containing 4 boxes with lids

Beads are made of nylon.

Tray and boxes are made of Beechwood 

Developmentally appropriate for ages 5.5 years +

Safety rated for 3 years +

SKU: C362

Please note that this is a budget version.  Click here for our collection of AMI-certified Montessori Math Materials.