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  1. Arabic Numbers System | Definition, Origin & Significance

  2. Who invented Arabic numerals? | Homework.Study.com

  3. Who invented numbers? - Homework.Study.com

  4. Where did arabic numerals originate? | Homework.Study.com

  5. Video: Arabic Numbers System | Definition, Origin & Significance

  6. Ancient Number Systems | Types & Symbols - Lesson - Study.com

  7. History of Roman Numerals | Origins & Uses - Lesson - Study.com

  8. What year were Roman numerals invented? | Homework.Study.com

  9. Who invented the decimal system? | Homework.Study.com

  10. Who invented the Quarter coin? | Homework.Study.com