Further Explanation: Strands

From APEC HRDWG Wiki

The 12 economies in this Analysis of Mathematics Standards organize their standards according to a variety of strands, or domains, using varying levels of specificity; some are very broad categories, while some use more specific topics to arrange their standards.  Many economies use similar strand titles to organize their standards.

To categorize the economies' mathematics standards, a mathematics coding framework developed by Michigan State University that organizes content into 10 strands was used:

1. Number
2. Measurement
3. Geometry: Position, Visualization, Shape
4. Geometry: Symmetry, Congruence, Similarity
5. Proportionality
6. Functions, Relations, Equations
7. Data Representation, Probability, Statistics
8. Elementary Analysis
9. Validation, Structure
10. Other Content

There is also information with regards to strands and standards in the Singapore Mathematics section.