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  2. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    If the repetend is a zero, this decimal representation is called a terminating decimal rather than a repeating decimal, since the zeros can be omitted and the decimal terminates before these zeros. [1] Every terminating decimal representation can be written as a decimal fraction, a fraction whose denominator is a power of 10 (e.g. 1.585 ...

  3. Parasitic number - Wikipedia

    en.wikipedia.org/wiki/Parasitic_number

    Pick a one digit integer k such that k ≥ n, and take the period of the repeating decimal k/(10n−1). This will be () where m is the length of the period; i.e. the multiplicative order of 10 modulo (10n − 1). For another example, if n = 2, then 10n − 1 = 19 and the repeating decimal for 1/19 is

  4. Prime reciprocal magic square - Wikipedia

    en.wikipedia.org/wiki/Prime_reciprocal_magic_square

    In contrast with its rows and columns, the diagonals of this square do not sum to 27; however, their mean is 27, as one diagonal adds to 23 while the other adds to 31.. All prime reciprocals in any base with a period will generate magic squares where all rows and columns produce a magic constant, and only a select few will be full, such that their diagonals, rows and columns collectively yield ...

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Using all numbers and all letters except I and O; the smallest base where ⁠ 1 / 2 ⁠ terminates and all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 18 ⁠ have periods of 4 or shorter. 35: Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O. 36: Hexatrigesimal [57] [58]

  6. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    So too are the thousands, with the number of thousands followed by the word "thousand". The number one thousand may be written 1 000 or 1000 or 1,000; larger numbers are written for example 10 000 or 10,000 for ease of reading. European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator.

  7. Decimal - Wikipedia

    en.wikipedia.org/wiki/Decimal

    Place value of number in decimal system. The decimal numeral system (also called the base-ten positional numeral system and denary / ˈ d iː n ər i / [1] or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers (decimal fractions) of the Hindu–Arabic numeral system.

  8. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    To change a common fraction to a decimal, do a long division of the decimal representations of the numerator by the denominator (this is idiomatically also phrased as "divide the denominator into the numerator"), and round the answer to the desired accuracy. For example, to change ⁠ 1 / 4 ⁠ to a decimal, divide 1.00 by 4 (" 4 into 1.00 ...

  9. Cyclic number - Wikipedia

    en.wikipedia.org/wiki/Cyclic_number

    (10 18 − 1) / 19 = 052631578947368421 (18 digits) (10 22 − 1) ... All cyclic numbers are divisible by b − 1 where b is the base (e.g. 9 in decimal) and the sum ...