Montessori Binomial Cube

It is made for children 3 years and up. Young children build it as a 3D puzzle by color. Older children copy the pattern on the lid and compare the sizes of the blocks.

8 painted wooden blocks and the wooden box with its lid: 1 red cube, 3 red-and-black blocks, 3 blue-and-black blocks and 1 small blue cube.

The box is about 11 x 11 x 8 cm (4.3 x 4.3 x 3.1 in), so it fits easily on a shelf or a small table.

Fold down two sides of the box, take the 8 blocks out, then build the cube again inside the box. The lid shows the pattern of the cube's top, so your child can check the work alone.

It is a classic Montessori material. Its 8 blocks are the parts of (a + b)³: one large cube, one small cube and two sets of 3 matching blocks. Young children use it as a 3D puzzle; the math comes years later.

It is hands-on, made of wood and shows its own mistakes: if a block is in the wrong place, the cube does not fit together or the colors do not match. Children find and fix errors on their own.

It is safety tested and painted with non-toxic, water-based paint. It is made for children 3 years and up.

Yes. Orders over $70 ship free in the US, and every order has 60-day returns.