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  1. Addition - Practice with Math Games

  2. Math Trainer - Addition - Math is Fun

  3. Addition Worksheets - Math-Drills

  4. Addition Worksheets & Free Printables - Education.com

  5. Addition worksheets for K-5 - K5 Learning

  6. Learn addition - IXL

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

  8. Addition Worksheets - Math Worksheets 4 Kids

  9. Addition Worksheets - Math is Fun

  10. Multi-digit addition worksheets - K5 Learning