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There are some examples of year numbers after 1000 written as two Roman numerals 1–99, e.g. 1613 as XVIXIII, corresponding to the common reading "sixteen thirteen" of such year numbers in English, or 1519 as X XIX as in French quinze-cent-dix-neuf (fifteen-hundred and nineteen), and similar readings in other languages.
Unless, of course, the letters, not read as Roman numerals, compose a word with another meaning, e.g. MIX. There is a unicode range of characters that is specifically used for Roman numerals, for example " Ⅰ " (0x2160) and " ⅰ " (0x2170) – such (individual) characters are redirect pages to the the above-linked section about Roman numerals ...
It contrasts with date and time notation in the United States, where the month is placed first, leading to confusion in international communications: in the United States, 2/11/03 is interpreted as 11 February 2003. To remedy this, the month is sometimes written in Roman numerals, a format common in some European countries: 2.xi.03. [1]
In early numeral systems, such as Roman numerals, a digit has only one value: I means one, X means ten and C a hundred ... (6 × 10 2) + (7 × 10 1) + ...
Roman numerals can be used to notate and analyze the harmonic progression of a composition independent of its specific key. For example, the ubiquitous twelve-bar blues progression uses the tonic (I), subdominant (IV), and dominant (V) chords built upon the first, fourth and fifth scale degrees respectively.
The earliest confirmed chronograms using Roman numerals were devised in the mid 14th century but retrospective chronograms which express earlier dates are known. [2] Chronograms were particularly popular during the Renaissance , when chronograms were often used on tombstones and foundation stones to mark the date of the event being commemorated.
666 is also the sum of the squares of the first seven primes (2 2 + 3 2 + 5 2 + 7 2 + 11 2 + 13 2 + 17 2), [7] [10] while the number of twin primes less than 6 6 + 666 is 666. [11] A prime reciprocal magic square based on in decimal has a magic constant of 666.
The following are the thirteen books that are available in the series. Guaranteed to Bend Your Brain (previously Murderous Maths) (1997), ISBN 0-439-01156-6 - (addition, subtraction, multiplication, division, percentages, powers, tessellation, Roman numerals, the development of the "10" and the place system, shortcomings of calculators, prime numbers, time - how the year and day got divided ...