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  1. 20+ Arithmetic Books for Free! [PDF] - InfoBooks.org

  2. Fundamentals of Mathematics - Open Textbook Library

  3. The Higher Arithmetic: An Introduction to the Theory of Numbers

  4. 460 Free Textbooks – Math, Science, and More [Online PDF for …

  5. Math - OpenStax

  6. Elementary Algebra - Open Textbook Library

  7. City University of New York

  8. Free Contemporary Mathematics Book for Download - OpenStax

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