Centesimal FrameFractions as Decimal Fractions
The first photo is the maker's own. The other shots are illustrative.
Inv. no. NIE-012500
- Maker
- Nienhuis Montessori, since 1929
- Approval
- AMI
- Frame
- Durable plastic
- Markings
- Printed degree labels
- EAN
- 8719924006938
Final price incl. VAT. Delivery €5.90, €114.10 to go for free delivery.
Advice, warranty and returns are handled by us.
Why it costs €34.90
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 8719924006938 is on the box. It is the maker's number, not ours.
Centesimal Frame in a child's hands
A metal frame used with the fraction circles to show how a fraction can be rewritten as a decimal. It is the bridge between two things a child has learned separately: that a whole can be cut into thirds, and that a whole can be cut into tenths and hundredths. The frame puts one over the other so a third stops being an alternative to 0.333 and starts being the same quantity written differently. Fraction circles sold separately. Metal, for ages 6 to 12.
Mathematical Understanding
Develops concrete understanding of angles, degrees, and geometric relationships through hands-on measurement.
Precision and Accuracy
Cultivates attention to detail and careful observation skills essential for advanced mathematical work.
Practical Application
Bridges abstract geometric concepts with real-world measurement skills used in design and construction.
How to present it
Place the Centesimal Frame on a mat with a selection of geometric shapes, rulers, and paper. Ensure adequate lighting and a stable work surface. Have pencils and recording sheets available.
- 1Demonstrate holding the frame steady against a corner or angle to be measured
- 2Guide the child to read the degree marking where the second edge crosses the scale
- 3Practice measuring various angles found in the environment
- 4Introduce angle construction by drawing specific angles using the frame as a guide
- 5Record measurements systematically on prepared sheets
3 tips for parents
- Point out angles in everyday life - roof slopes, opening doors, folding paper - to reinforce learning
- Encourage precision without rushing; accurate measurement takes patience and practice
- Support home projects that involve angle measurement like building models or creating geometric art
If you are not sure it suits your child, we answer in person.
Norbert Kovalčín, founder of Faborino · write to him
There is no review here yet. We will ask you for one after you buy. Write the first review
What's in the Box
- Centesimal Frame: Large semicircular protractor with dual-sided markings
Size and material
| Packaging | 14 × 14 × 1 cm |
| Frame | Durable plastic |
| Markings | Printed degree labels |
| Recommended Age | 6-12 years |
Care
Wipe with damp cloth; avoid abrasive cleaners
Frequently Asked Questions
What is the Centesimal Frame and how is it used in Montessori education?
The Centesimal Frame is a large semicircular protractor teaching tool that introduces children to angular measurement through hands-on exploration. It features clear degree markings from 0-90° on both sides, allowing children to measure and construct angles while developing spatial awareness and geometric understanding through practical life activities.
Why is this considered a Practical Life material rather than Mathematics?
While teaching mathematical concepts, the Centesimal Frame is classified as Practical Life because it emphasizes real-world applications of angle measurement. Children use it to explore angles in their environment, architecture, and everyday objects, developing precision and coordination while connecting abstract concepts to practical experiences.
What specific skills do children develop using the Centesimal Frame?
Children develop multiple skills including precise angle measurement, understanding of geometric relationships, fine motor control, spatial reasoning, and mathematical vocabulary. The material also enhances concentration, accuracy in measurement, and the ability to translate between concrete angles and abstract numerical representations.
How does the double-sided 0-90° marking system benefit learning?
The double-sided marking system allows children to measure angles from either direction, promoting flexibility in thinking and problem-solving. This design helps children understand that angles can be approached from different perspectives and supports various measurement activities without repositioning the frame.
What activities can children do with the Centesimal Frame beyond basic measurement?
Children can create angle collections from their environment, construct specific angles for geometric designs, explore complementary and supplementary angles, investigate angles in architecture and nature, and use it for technical drawing exercises. These activities bridge practical applications with mathematical understanding.
Product safety
Manufacturer: Nienhuis Montessori, Anders Celsiusstraat 15, 7442 PB Nijverdal, Netherlands
Centesimal Frame