for instance) because 9 is the number below ten. In decimal, dividing by three twice (ninths) only gives one digit periods ( 1 / 9 = 0.1111. Numbers in vigesimal notation use the convention that I means eighteen and J means nineteen.Īs 20 is divisible by two and five and is adjacent to 21, the product of three and seven, thus covering the first four prime numbers, many vigesimal fractions have simple representations, whether terminating or recurring (although thirds are more complicated than in decimal, repeating two digits instead of one). For example, 10 means ten, 20 means twenty. In the rest of this article below, numbers are expressed in decimal notation, unless specified otherwise.
The number twenty is written as 10 20.Ģ0 20 is equivalent to forty in decimal = (2 × 20 1) + (0 × 20 0) D0 20 is equivalent to two hundred and sixty in decimal = (13 × 20 1) + (0 × 20 0) 100 20 is equivalent to four hundred in decimal = (1 × 20 2) + (0 × 20 1) + (0 × 20 0). Another less common method skips over the letter "I", in order to avoid confusion between I 20 as eighteen and one, so that the number eighteen is written as J 20, and nineteen is written as K 20. This is similar to the common computer-science practice of writing hexadecimal numerals over 9 with the letters "A–F". One modern method of finding the extra needed symbols is to write ten as the letter A 20 (the 20 means base 20), to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet. In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. Vigesimal is derived from the Latin adjective vicesimus, meaning 'twentieth'. A vigesimal ( / v ɪ ˈ dʒ ɛ s ɪ m əl/) or base-20 ( base-score) numeral system is based on twenty (in the same way in which the decimal numeral system is based on ten).
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