Thinkamajigs Cubes
Buy Thinkamajigs cubes online.
MontiPlanet.ca offers a complete overview of all Montessori Thinkamajigs cubes.
Products
The cubes are sensorial materials. Kids treat them and play with them as 3D puzzles. However, they provide an introduction to the concept of (a + b)³ that will be useful later when they learn math.