K5 Learning reviews how to add negative numbers with some easy to follow rules.
Adding positive and negative integers on a number line
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Adding Positive and Negative Numbers - KATE'S MATH LESSONS
Adding and subtracting positive and negative numbers worksheet
Operations with positive and negative numbers interactive worksheet
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Negtive and Positive Rules for Integers (Free Cheat Sheet)
Adding Positive And Negative Numbers Worksheets
Negative and Positive Numbers: Worksheets and Activities
TI-AIE: Using a number line and the expression 'Imagine if …': positive and negative numbers: View as single page