Instrument Measurement Of Angles, Metal
Part of the Introduction to Numbers collection, this precision metal protractor features a full 360-degree circular scale with clearly engraved markings, essential for advanced geometry work in the Montessori elementary classroom. The durable metal construction and precise calibration support accurate angle measurement activities, helping children develop mathematical precision and spatial reasoning through active discovery of geometric concepts.
“The child is both a hope and a promise for mankind.”
The Instrument Measurement of Angles introduces elementary children to precise mathematical tools when their minds naturally seek exactness and abstraction.
- Accurate measurement and comparison of angles using the 360-degree scale
- Understanding of angle classification: acute, right, obtuse, straight, and reflex
- Development of mathematical precision through careful alignment and reading
- Connection between angular measurements and real-world applications
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This metal protractor's 360-degree circular scale bridges sensorial experiences with abstract geometric concepts, arriving precisely when children begin questioning relationships between shapes and spaces. The clearly engraved markings on metal satisfy the elementary child's need for precision - each degree visually distinct, allowing independent verification of angle measurements. Unlike simplified tools, this professional-grade instrument respects children's capability for accuracy, enabling them to discover that angles exist everywhere: in architecture, nature, and artistic designs. The metal construction ensures durability through repeated explorations, as children progress from measuring existing angles to constructing their own geometric designs. This instrument transforms angle measurement from abstract numbers into concrete experiences, allowing children to physically manipulate and measure the very concepts that govern spatial relationships in their world.
How to present it
Follow the Montessori method of presentation for optimal child development.
Place the metal protractor on a table with geometry paper, pencil, and ruler. Prepare angle cards showing various angles drawn clearly for initial measurement practice.
- 1
Demonstrate placing the protractor's center point precisely on the angle's vertex
Use a magnifying glass initially to ensure children see the exact alignment - 2
Align the baseline of the angle with the zero-degree mark on the protractor
Rotate the paper rather than the protractor for easier alignment - 3
Read the measurement where the second ray crosses the degree markings
For angles over 180°, subtract the visible reading from 360° - 4
Record measurements and classify each angle by type
Create a measurement journal for tracking discoveries
Every Child Is a Little Creator
Heritage
Since 1929
Brands used by
schools worldwide
European brands
AMI
Endorsed
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