Students will learn how to determine whether two expressions are equivalent, where each expression is a fraction with or without negative signs. For example, \(5/b\) is equal to \(-5/-b,\) but is not equal to \(5/-b.\) Here's a lesson. Students can practice here and here.

Next, give your students this challenge:

Highest and Lowest by NRICH

Conclude by leading this investigation:

A little bit of Aggression (addition, subtraction)

by MathPickle