Negative number addition and subtraction: equivalent expressions

The  exercise appears under the 7th grade (U.S.) Math Mission. This exercise practices finding equivalent expressions with negative numbers.

Types of Problems
There is one type of problem in this exercise:
 * 1. Which of the following expressions are equivalent?: This problem has an equation and the student is asked to find which other expression is equivalent.

Strategies
Knowledge of adding and subtracting negative numbers is essential to ensure success in this exercise.
 * 1. Number lines are useful for adding and subtracting negative numbers.
 * 2. The numbers in this exercise are pretty small, so this exercise is easier for speed badges.