Triangular Prisms2 Identical Geometric Solids for Exploration
The first photo is the maker's own. The other shots are illustrative.
Inv. no. NIE-018804
- Maker
- Nienhuis Montessori, since 1929
- Approval
- AMI
- Product size
- 10 × 10 cm
- Primary Material
- Painted wood
- Finish
- Smooth lacquered surface
- EAN
- 8719924009946
Final price incl. VAT. Delivery €5.90, €66.10 to go for free delivery.
Advice, warranty and returns are handled by us.
Why it costs €82.90
Behind the price of the original are things you can check yourself.
AMI approval
The material is approved by the Association Montessori Internationale (AMI). Nienhuis has made Montessori materials since 1929.
A verifiable original
The EAN 8719924009946 is on the box. It is the maker's number, not ours.
Triangular Prisms in a child's hands
Two identical blue prisms on a triangular base, from the volume set derived from a base of 10 by 10 cm and a height of 20 cm. They come as a pair because the triangle is half of the square: stood together the two rebuild the square based prism of the same set exactly, which is how a child discovers that halving a base halves the volume without anyone writing it down. One prism proves nothing, two prove it in a second. Sold as a pair, for ages 6 to 12.
Spatial Intelligence
Manipulating and combining the prisms develops three-dimensional thinking and understanding of how shapes relate to one another.
Mathematical Reasoning
Discovering that two triangular prisms equal one rectangular prism introduces concepts of volume, fractions, and geometric relationships.
Abstract Thinking
Supports the transition from concrete geometric forms to abstract mathematical concepts in upper elementary studies.
How to present it
Place both triangular prisms on a mat with the rectangular prism from the Geometric Solids nearby. Ensure adequate workspace for manipulation and comparison.
- 1Invite the child to explore one triangular prism, identifying its faces, edges, and vertices
- 2Compare the two triangular prisms to establish they are identical (congruent)
- 3Demonstrate joining the two prisms along their rectangular faces
- 4Guide discovery that the combined shape forms a rectangular prism
- 5Compare the formed rectangular prism with the solid rectangular prism
3 tips for parents
- Look for triangular prisms in everyday life (chocolate bars, roof shapes) to reinforce learning
- Support mathematical language by using terms like 'faces,' 'edges,' and 'vertices' in conversation
- Encourage building with blocks at home to extend spatial reasoning practice
If you are not sure it suits your child, we answer in person.
Norbert Kovalčín, founder of Faborino · write to him
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What's in the Box
- Triangular Prisms: 2 identical pieces
Size and material
| Product size | 10 × 10 cm |
| Packaging | 25 × 11 × 8 cm |
| Primary Material | Painted wood |
| Finish | Smooth lacquered surface |
| Recommended Age | 6-12 years |
Care
Wipe with slightly damp cloth, dry immediately
Frequently Asked Questions
What are the dimensions and materials of these triangular prisms?
These triangular prisms are made of solid wood with a smooth lacquered finish in Montessori blue. Each prism measures approximately 10cm in length with equilateral triangular bases. The identical size ensures they fit together perfectly to demonstrate geometric relationships.
How do these prisms support elementary geometry learning?
Children discover that two identical triangular prisms combine to form a rectangular prism, reinforcing concepts of volume, surface area, and geometric relationships. This hands-on exploration helps students understand how complex shapes can be decomposed and recomposed, supporting advanced mathematical thinking.
What activities can children do with these triangular prisms?
Students can trace bases and faces, calculate surface area and volume, explore cross-sections, create geometric patterns, and combine them with other geometric solids. They're particularly useful for lessons on prisms, polyhedra, and spatial relationships in elementary mathematics.
Why are two identical prisms included in this set?
Two identical prisms are essential for demonstrating the fundamental geometric principle that two triangular prisms equal one rectangular prism. This paired design allows children to physically manipulate and visualize this relationship, making abstract concepts concrete and memorable.
How do these prisms connect to the broader Montessori geometry curriculum?
These prisms extend the work begun with the Geometric Solids in primary, connecting to elementary studies of volume, equivalence, and the nomenclature of geometric forms. They prepare students for more advanced work with the Theorem of Pythagoras and geometric cabinet extensions.
Product safety
Manufacturer: Nienhuis Montessori, Anders Celsiusstraat 15, 7442 PB Nijverdal, Netherlands
Triangular Prisms