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  1. Addition worksheets for K-5 - K5 Learning

  2. Elementary addition -- A complete course in arithmetic

  3. Addition Worksheets For Grade 1-8: Free And Printable

  4. Addition Worksheets & Free Printables - Education.com

  5. Addition and SubtractionElementary Math

  6. Basic Addition Facts - Super Teacher Worksheets

  7. Addition Worksheets for Kids - Math Worksheets 4 Kids

  8. 28 Free Hands-On Addition Activities and Online Games

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

  10. Addition Activities for Early Elementary Students | ABCmouse