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  2. Decimal - Wikipedia

    en.wikipedia.org/wiki/Decimal

    Decimal fractions (sometimes called decimal numbers, especially in contexts involving explicit fractions) are the rational numbers that may be expressed as a fraction whose denominator is a power of ten. [8] For example, the decimal expressions ,,,, represent the fractions ⁠ 8 / 10 ⁠, ⁠ 1489 / 100 ⁠, ⁠ 79 / 100000 ⁠, ⁠ + 1618 / ...

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    A binary clock might use LEDs to express binary values. In this clock, each column of LEDs shows a binary-coded decimal numeral of the traditional sexagesimal time.. The common names are derived somewhat arbitrarily from a mix of Latin and Greek, in some cases including roots from both languages within a single name. [27]

  4. Computer number format - Wikipedia

    en.wikipedia.org/wiki/Computer_number_format

    That is, the value of an octal "10" is the same as a decimal "8", an octal "20" is a decimal "16", and so on. In a hexadecimal system, there are 16 digits, 0 through 9 followed, by convention, with A through F. That is, a hexadecimal "10" is the same as a decimal "16" and a hexadecimal "20" is the same as a decimal "32".

  5. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    Stating acuity as a decimal number is the standard in European countries, ... 40 1.60 20/600 10/300 6/180 3/90 0.033 30 1.48 20/500 10/250 6/150 3/75 0.04 25

  6. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    Any such symbol can be called a decimal mark, decimal marker, or decimal sign. Symbol-specific names are also used; decimal point and decimal comma refer to a dot (either baseline or middle ) and comma respectively, when it is used as a decimal separator; these are the usual terms used in English, [ 1 ] [ 2 ] [ 3 ] with the aforementioned ...

  7. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system.

  8. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic ... [8] Table of values ... ⁠ 1 / 40 ⁠ 0.025 ...

  9. Sexagesimal - Wikipedia

    en.wikipedia.org/wiki/Sexagesimal

    The value of π as used by the Greek mathematician and scientist Ptolemy was 3;8,30 = 3 + ⁠ 8 / 60 ⁠ + ⁠ 30 / 60 2 ⁠ = ⁠ 377 / 120 ⁠ ≈ 3.141 666.... [28] Jamshīd al-Kāshī , a 15th-century Persian mathematician, calculated 2 π as a sexagesimal expression to its correct value when rounded to nine subdigits (thus to ⁠ 1 / 60 9 ...