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  2. Vigesimal - Wikipedia

    en.wikipedia.org/wiki/Vigesimal

    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). In the rest of this article below, numbers are expressed in decimal notation, unless specified otherwise. For example, 10 means ten, 20 means twenty. Numbers in vigesimal ...

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Covers the ten decimal digits and all letters of the ... 24, 30 (or 31 or 28 or 29), 12, 10, 10, 10} in timekeeping (12, 20) traditional English monetary system (£sd ...

  4. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    18 12: Hexadecimal: ... In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13).

  5. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  6. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    The positional decimal system is presently universally used in human writing. The base 1000 is also used (albeit not universally), by grouping the digits and considering a sequence of three decimal digits as a single digit. This is the meaning of the common notation 1,000,234,567 used for very large numbers.

  7. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator. As a result, some style guides [example needed] recommend avoidance of the comma (,) as either separator and the use of the period (.) only as a decimal point. Thus one-half would be written 0.5 in decimal, base ten notation ...

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  9. 12 (number) - Wikipedia

    en.wikipedia.org/wiki/12_(number)

    20 6: Octal: 14 8: Duodecimal: 10 12 ... Early Germanic numbers have been theorized to have been non-decimal: ... 12 is a composite number, the smallest abundant ...