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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. 20 (number) - Wikipedia

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

    20 (twenty) is the natural number following 19 and preceding 21. A group of twenty units is sometimes referred to as a score. [1] [2] In Mathematics.

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O. ... (12, 20) traditional English monetary system (£sd ...

  5. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    The system was vigesimal (base 20), so it has twenty digits. The Mayas used a shell symbol to represent zero. Numerals were written vertically, with the ones place at the bottom. The Mayas had no equivalent of the modern decimal separator, so their system could not represent fractions. [citation needed]

  6. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    Otherwise, using the foot, visual acuity is expressed relative to 20/20. For all practical purposes, 20/20 vision is equivalent to 6/6. In the decimal system, acuity is defined as the reciprocal value of the size of the gap (measured in arc minutes) of the smallest Landolt C, the orientation of which can be reliably identified. A value of 1.0 ...

  7. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    Thus one-half would be written 0.5 in decimal, base ten notation, and fifty thousand as 50 000, and not 50.000 nor 50,000 nor 50000. ... 20: a score (first power of ...

  8. Welsh numerals - Wikipedia

    en.wikipedia.org/wiki/Welsh_numerals

    The decimal system is widely used, but is rather uncommon for dates and ages. Larger numbers, however, tend to be expressed in this system e.g. 1,965 mil, naw cant chwe deg pump. In referring to years, on the other hand, the number of thousands is stated, followed by the individual digits, e.g. 1965 mil naw chwe(ch) pump.

  9. Decimal - Wikipedia

    en.wikipedia.org/wiki/Decimal

    Decimal fractions (sometimes called ... The Hungarian language also uses a straightforward decimal system. All numbers between 10 and 20 are formed regularly (e.g. 11 ...