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. Click here to view our entire collection of Casa/Primary (3 to 6 Years) Montessori materials Click here to view our entire collection of Casa/Primary (3 to 6 Years) Math materials Click here to view our entire collection of Elementary (6 to 12 Years) Math materials
