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  1. Basic Addition | Arithmetic (video) | Khan Academy

  2. Addition - Math is Fun

  3. Addition and Subtraction | Arithmetic | Khan Academy

  4. What is Addition? Definition, Formula, Properties & Examples

  5. Addition - Wikipedia

  6. Addition in Math: Definition, Examples, Formulas - DoodleLearning

  7. 1.4: Addition of Whole Numbers - Mathematics LibreTexts

  8. Addition - Meaning, Symbol, Parts of Addition, Methods, …

  9. 4 Ways to Add - wikiHow

  10. Add and subtract through 1,000,000 | Arithmetic | Math | Khan Academy