Konverter tal til og fra romertal
Numbers above 3,999 use vinculum notation: a line above a numeral multiplies its value by 1,000.
So IXDCXCIV = 9 694.
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Did you know?
The Subtraction Rule: Elegant Shorthand
The subtraction rule is what makes Roman numerals clever rather than just tedious. Instead of writing IIII for 4, you write IV: "one before five." Instead of DCCCC for 900, you write CM: "one hundred before one thousand." Only six subtractive pairs exist (IV, IX, XL, XC, CD, CM), and once you know them, you can read any Roman numeral instantly.
Read more →Why the NFL Chose Roman Numerals
When the Super Bowl started in 1967, the game was played in January but belonged to the previous season. Calling it "the 1966 championship played in 1967" was confusing. Roman numerals solved this elegantly: Super Bowl I, II, III. No year confusion, and it made the event feel like something ancient and important. Marketing genius disguised as tradition.
Read more →Hvor stammer romertal fra?
Man mener, at romertal stammer fra håndsignaler og tællestreger. Stregen I repræsenterer en finger, V repræsenterer åbningen mellem tommelfinger og fingre for fem, og X repræsenterer krydsede hænder for ti. Bogstaverne L, C, D og M stammer fra ændringer af græske bogstaver som chi, theta og phi til at repræsentere 50, 100, 500 og 1.000. Over tid blev disse mærker til de latinske bogstaver, folk kender i dag. Der er ingen 0 i det romerske alfabet, da begrebet tallet 0 først blev fuldt udviklet, efter at Indien opfandt det omkring 600 e.Kr. / 10600 HE.