Khan Academy
Khan Academy: Adding Integers With Different Signs
Adding integers with different signs.
Khan Academy
Khan Academy: Why Subtracting a Negative Equivalent to Adding a Positive
Intuition as to why subtracting a negative number is equivalent to adding the absolute value of that number
Imagine Learning Classroom
Learn Zillion: Add Integers Using a Number Line
In this lesson, you will learn how to add integers by using a number line. [1:53]
Other
Professor Freedman's Video Snippets Add/subtract Integer
Professor Ellen Freedman uses this very short video to explain how to add and subtract positive and negative integers. She offers tips on how to keep track of whether the answer is positive or negative.