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 XCCCXXV = 10 325.
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Did you know?
Fibonacci's Sales Pitch
Fibonacci didn't invent Hindu-Arabic numerals — they originated in India around 500 AD. But his 1202 book Liber Abaci was essentially a 600-page argument that these new numbers were better for business. He showed European merchants how place value and zero could transform trade and banking. He was right. By 1500, the debate was over.
Read more →Roman Numerals: A Font for Importance
Arabic numerals are transparent: you see 42 and register the quantity instantly. Roman numerals are opaque: XLII requires a beat of translation. That friction is the feature. It forces a pause, adds formality, and signals that this number is special. Roman numerals aren't a number system anymore. They're a design language for importance.
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.