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  1. What is the Size of a Ruler? - MeasuringKnowHow

  2. Online Ruler - Actual Size Measurements in mm, cm, and inches

  3. What is the Size of a Ruler? Complete Guide - MeasuringHow

  4. Ruler - Wikipedia

  5. Ruler measurements - DoodleLearning

  6. What is the average length of a ruler? - Answers

  7. How to Read a Ruler in Inches and Centimeters · PrepScholar

  8. What is a Ruler and How do you Read One? | DreamBox

  9. How to Read a Ruler: 10 Steps (with Pictures) - wikiHow

  10. How to Read a Ruler - HowStuffWorks

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