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Roman numerals - Wikipedia
Roman numerals - Simple English Wikipedia, the free encyclopedia
Roman numeral | Chart & Facts | Britannica
Roman numerals - Wikiwand
Roman Numerals: Their Origins, Impact, and Limitations
History of ancient numeral systems - Wikipedia
Roman numerals - Encyclopedia of Mathematics
How to Learn Roman Numerals: 11 Steps (with Pictures) - wikiHow
Appendix:Roman numerals - Wiktionary, the free dictionary
Intro to Roman numerals (video) | Khan Academy