# Trinomial Cube

From Montessori Album

Trinomial Cube | |
---|---|

Sensorial - Visual Discrimination of Form | |

Level | Primary |

Age | 4 + |

Prerequisites | Binomial Cube |

Materials | Trinomial Cube |

In this activity the child assembles a three-dimensional puzzle made up of 27 wooden blocks. This puzzle is the physical representation of the trinomial formula: (a+b+c)^{3}. This activity indirectly prepares the child to learn Algebra later on.

## Contents

## Presentations

### Presentation 1

- Invite the child to the lesson. Show him where the work is on the shelf, and name the work. Take the Trinomial Cube box to a table.
- Step two
- Step three

### Presentation 2

- Invite the child to take the Trinomial Cube box to a rug or table.
- Step two
- Step three
- Step four
- Step five
- Step six

### Video

## Points of Interest

## Control of Error

- The diagrams on the sides of the box remind the child of the pattern that each level of the blocks should make.
- The blocks will not fit back in the box unless the cube in constructed correctly.

## Variations and Extensions

## Material

### Where to Buy

Adena $32.65

Albanesi $209.00

Alison's $59.99

Bruins $155.00

Bruins $121.00 (unpainted wood)

E & O $210.00

Hello Wood $179.00

Kid Advance $34.99

Montessori Outlet $31.95

Nienhuis $189.40

Thinkamajigs $41.95

## Further Reading

- Basic Montessori: Learning Activities for Under-fives by David Gettman, pages 94-97