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# The Montessori Geometric Solids: Purpose and Presentation

The Montessori Geometric Solids is arguably one of the most fun and fascinating of all the sensorial materials. These appealing three-dimensional shapes really beckon children to explore them.

What is their purpose, though? They look like fun, but what are children learning through their use? And how do you use them?

In this article, you will learn all about the geometric shapes in Montessori. You learn their purpose, how to present them as a sensorial activity, and you will get some other fun activity ideas that will spark further learning and creativity.

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## What are the Geometric Solids in Montessori?

The Montessori Geometric Solids material is a set of 10 wooden 3-D shapes that are sanded smooth and painted blue. They are housed in a wooden box along with stands for the solids that may roll.

The purpose of these 3-D shapes is to demonstrate how 3-dimensional shapes are related to 2-dimensional shapes.

For example, when a child works with the square-based pyramid, they will see that the sides are made up of 4 triangles and the base consists of 1 square.

The shapes included in the material:

• cube
• sphere
• cylinder
• rectangular prism
• square-based pyramid
• triangular-based prism
• ovoid
• ellipsoid
• cone
• triangular prism

This is great preparation for future geometry and trigonometry work, as hands-on exploration of three-dimensional shapes is helpful for gaining a deeper understanding of concepts like angles, planes, and trigonometric functions.

While this material is a preparation for the complicated math work that lies ahead, the Geometric Solids are presented to a child in a simple and fun way – and without any advanced mathematical jargon.

After all, this is a sensorial material and not a math material.

At the time this activity is presented, during the second year of a Montessori primary program, a child may have already worked with some of the shapes during language arts activities, however, that is not always the case.

Children will work with these geometric shapes again during the elementary years when they learn more in-depth physical science and geometry.

### Montessori geometric shapes material

While some Montessori sensorial materials are difficult to find for purchase, the Geometric Shapes are not, however finding a well-made set can be a challenge. Below is a set, which we are finding to be very sturdy.

It comes with all of the solid shapes, stands for the sphere, ovoid, and ellipsoid, and the Geometric Bases, which are used for extension activities.

### Indirect aims

• pre-geometry work

• visual

### Points of interest

• the smoothness of the sold shapes
• the different shapes
• that some of the solids roll and some don't

## How to present the Montessori Geometric Solids lesson

Note: This lesson should be presented on a large floor mat. If the child is not ready to learn all of the names of the geometric shapes, it is fine to only introduce the ones with simple names; cylinder, sphere, cone, and cube.

A three-period vocabulary lesson should accompany this activity.

• Carry the box of Geometric Solids to the work mat and place them in a row in the order you plan on introducing them, from left to right.
• Explain to the child that you will be exploring how each solid feels.
• Pick up the shape to the far left and either look away or close your eyes.
• Touch the shape on all sides with both hands, exploring it fully.
• Explain to the child that you are now going to explore how the shapes moves.
• Place the shape down on the mat and slide it and roll it on all sides. Watch how it rolls or tumbles.
• Place the shape back in the row and continue with these 2 steps for all 10 solids.
• Invite the child to preform the activity.

## Geometric Solids extension activities

### Sorting the Montessori geomtric shapes

Have the child sort the shapes by how they feel and/or how they move. For example, the child can place all the shapes that roll together and all the shapes that slide together.

The child will discover that some of the shapes can both roll and slide and they will often put them in their own category.

### Stereognostic activities

Place a few of the Geometric Solids into a bag and invite the child to identify them prior to pulling them from the bag.

You can also ask the child to find a specific solid in the bag without looking.

### Play-doh solids

Invite the child to recreate each geometric shape using play-doh.

### Matching the solids to their bases

Create a matching activity by making 2 rows, one of the bases and one with solids. Each set should be randomly placed and the child is tasked with matching the solids to their Geometric Bases.

### Build a castle

Place all of the solids in the set randomly on the rug and invite the child to build a castle. Though there is no one correct way to build it, have them notice that the square-based pyramid fits perfectly on top of the cube, etc.

The Montessori Geometric Solids is such a fun material. After working with some of these activities, children will often begin to notice, or even seek out, certain 3-D and 2-D geometric shapes in their environment.

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