# Mathematics: Geometric Solids

Geometric Solids not only form some of the groundwork for geometry but encourage exploration and creative thinking. The apparatus comes in a set of 10 wooden 3-D shapes, including:

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

One of the most effective ways to introduce geometric shapes to children is with a three-period lesson, which is a classic Montessori technique for teaching the name of things. When combining this technique with geometric solids, you have a wonderful introduction to Montessori geometry that also activates a sensorial response from the child. Once named and understood, shapes can be stacked, balanced, and could even form part of imaginary play.

The lesson will proceed as follows:

First period: introduce each 3-D shape, one by one, asking the child to hold each shape and repeat its name.

Second period: ask the child to point out the shape as you name it (“sphere”, “oval”, “cube”). It’s important to spend time in this period, playing games to make sure the child is fully aware of each 3-D shape

Third period: ask the child to name each of the shapes whilst pointing to the corresponding form.

Watch the below tutorial by Wonderful World of Montessori to see the lesson in action:

After working through the 3-D shapes, children will often begin to notice, or even seek out, certain 3-D geometric shapes in their environment, which could become a fun game for you to encourage at home or as you are out and about.

If you’d like further information about this tutorial, feel free to contact us at info@saintandrewsmontessori.com. We’re happy to answer any questions.

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