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  1. Addition - Math is Fun

  2. Addition worksheets for K-5 - K5 Learning

  3. Basic addition - Math made easy - YouTube

  4. Basic Addition Facts - Super Teacher Worksheets

  5. Free Addition Worksheets—Printable with Answers - Mashup Math

  6. Basic Addition & Subtraction Facts — Online Practice (grades 1-2)

  7. Unit 2: Addition and subtraction - Khan Academy

  8. Khan Academy

  9. Addition in Math: Definition, Examples, Formulas

  10. Addition - Math.net