Tag Archives: Mathematics

Origins of the Coordinate Plane

One of the legends of math relates to the invention of the coordinate plane system. The legend states that Descartes was inspired to invent this system after watching a fly move around on the ceiling over his bed. This post tells the story and points out its relevance for modern math teachers.

Finding domain and range — with color!

Finding the domain and range of functions confuses many students. Using color to code the domain and range separately helps students distinguish domain and range, and thereby helps them find the domain and range for continuous functions.

Common Algebra Mistake: Interpreting Negative Signs in Front of Parentheses

Tricky area of algebra: negative signs in front of parentheses. This explains how we can help students relate the concept to everyday life, and thereby grasp it so they remember it!