Wyzant
Wyzant: Simplifying Multiple Positive or Negative Signs
Students learn how to simplify multiple positive or negative signs. The resource consists of lessons with examples, a combining like terms calculator, an equation calculator, and a activity to check for comprehension.
Help Algebra
Help algebra.com: The Real Number System
Natural numbers, whole numbers, integers and rational numbers begin this lesson on the real number system. You can also learn more about the number line and absolute value. Examples and diagrams are included to enhance understanding.
University of St. Andrews (UK)
University of St. Andrews: Nicholas Chuquet
This site from the University of St. Andrews provides a biography of mathematician Nicholas Chuquet, who was the first to use negative numbers as exponents and coefficients.
Cool Math
Coolmath: Solving Inequalities the Freaky Thing
This CoolMath resource will help students learn how to solve inequalities. Dividing by negative numbers is featured.