Convert numbers to and from Roman numerals
Numbers above 3,999 use vinculum notation: a line above a numeral multiplies its value by 1,000.
So XCCCXXIV = 10,324.
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Try Multiplying XLVII by CCXIV
That's 47 times 214. In Hindu-Arabic numerals, you can do it on paper in 30 seconds. In Roman numerals, you need an abacus and a headache. This isn't a minor inconvenience — it made advanced science, algebra, and eventually calculus essentially impossible. The Romans built aqueducts and roads, but they did their math on counting boards.
Read more →Big Ben Gets It Wrong (On Purpose)
London's Big Ben uses IV instead of the traditional IIII that most clocks prefer. It's one of the few famous clocks that follows "correct" Roman numeral rules. The irony: a clock considered a symbol of precision breaks with a tradition that every village clockmaker respects.
Read more →Where do Roman numerals come from?
It is thought Roman numerals come from hand signals and tally marks. The stroke I represents a finger, the V represents the gap between thumb and fingers for five, and the X represents hands crossed for ten. The L, C, D, and M come from modifications of Greek letters like chi, theta, and phi to represent 50, 100, 500, and 1,000. Over time, these marks changed into the Latin letters people recognize today. There is no 0 in the Roman alphabet, as the concept for the number 0 didn't fully develop until India invented it around 600 CE / 10600 HE.