Metal Triangles
The first photo is the maker's own. The other shots are illustrative.
Inv. no. NIE-011600
- Maker
- Nienhuis Montessori, since 1929
- Approval
- AMI
- Frames and insets
- Metal
- Colour
- Green, red
- EAN
- 8719924006686
Final price incl. VAT. Free delivery.
Advice, warranty and returns are handled by us.
Why it costs €184.90
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 8719924006686 is on the box. It is the maker's number, not ours.
Metal Triangles in a child's hands
Four metal frames with their bottoms, holding equilateral triangles divided into one, two, three and four parts. The work is analytical: a child takes the halves out of one frame and lays them into another, finds where a third and a quarter can and cannot substitute for each other, and builds the vocabulary of triangle study from what the pieces actually do. Because every division starts from the same equilateral triangle, the comparisons are exact rather than approximate. Metal frames with insets, for ages 6 to 12.
Geometric Understanding
Children explore the relationships between the whole equilateral triangle and its halves, thirds and quarters through hands-on manipulation.
Mathematical Abstraction
Progresses from concrete shape recognition to abstract understanding of geometric principles and theorems.
Fine Motor Precision
Taking the pieces out of the frames and fitting them back refines hand control and hand-eye coordination.
Visual Discrimination
Comparing the divisions of the same triangle develops acute observation skills and mathematical categorization abilities.
How to present it
3 tips for parents
- Look for triangles in everyday objects and classify them together
- Use building materials like straws to construct different triangle types
- Practice triangle vocabulary during walks by identifying roof shapes
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
- Frame: whole (1): Metal frame with a bottom and an inset in the shape of an equilateral triangle
- Frame: halves (1/2): Metal frame with a bottom and insets in the shape of an equilateral triangle
- Frame: thirds (1/3): Metal frame with a bottom and insets in the shape of an equilateral triangle
- Frame: quarters (1/4): Metal frame with a bottom and insets in the shape of an equilateral triangle
Size and material
| Packaging | 15 × 15 × 8 cm |
| Frames and insets | Metal |
| Colour | Green, red |
| Recommended Age | 6-12 years |
Care
Wipe with damp cloth; dry immediately to prevent rust
Frequently Asked Questions
What is included in this set?
The set consists of four metal frames with bottoms. The insets are equilateral triangles divided into one, two, three and four parts: 1, 1/2, 1/3 and 1/4.
How do children use the Metal Triangles in geometry lessons?
A child takes the halves out of one frame and lays them into another, and finds where a third and a quarter can and cannot substitute for each other. Because every division starts from the same equilateral triangle, the comparisons are exact rather than approximate.
What age group is this material designed for?
The Metal Triangles are designed for elementary students aged 6-12 years. They're typically introduced after children have mastered basic geometric shapes and are ready for more advanced exploration of triangle properties and geometric relationships.
How do these differ from the basic geometric cabinet triangles?
The geometric cabinet presents triangles as shapes to name and compare. The Metal Triangles take one equilateral triangle and divide it into halves, thirds and quarters, so the work is about fractions of a single shape.
What skills do children develop using the Metal Triangles?
Children develop an understanding of fractions and of how the parts of one equilateral triangle relate to each other. Handling the parts also improves fine motor control, and comparing the divisions builds spatial reasoning and mathematical thinking.
Product safety
Manufacturer: Nienhuis Montessori, Anders Celsiusstraat 15, 7442 PB Nijverdal, Netherlands
Metal Triangles