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  2. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Also, some fractions (such as 1 ⁄ 7, which is 0.14285714285714; to 14 significant figures) can be difficult to recognize in decimal form; as a result, many scientific calculators are able to work in vulgar fractions or mixed numbers.

  3. Binary number - Wikipedia

    en.wikipedia.org/wiki/Binary_number

    To convert a hexadecimal number into its binary equivalent, simply substitute the corresponding binary digits: 3A 16 = 0011 1010 2 E7 16 = 1110 0111 2. To convert a binary number into its hexadecimal equivalent, divide it into groups of four bits. If the number of bits isn't a multiple of four, simply insert extra 0 bits at the left (called ...

  4. Non-decimal currency - Wikipedia

    en.wikipedia.org/wiki/Non-decimal_currency

    A British gold sovereign with a face value of £1. Prior to decimalisation on 15 February 1971, £1 was made up of 240 pence.. A non-decimal currency is a currency that has sub-units that are a non-decimal fraction of the main unit, i.e. the number of sub-units in a main unit is not a power of 10.

  5. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    If the given number is in decimal and the target base is duodecimal, the method is same. Using the digit conversion tables: (decimal) 10,000 + 2,000 + 300 + 40 + 5 + 0.6 = (duodecimal) 5,954 + 1,1A8 + 210 + 34 + 5 + 0; 7249. To sum these partial products and recompose the number, the addition must be done with duodecimal rather than decimal ...

  6. Undecimal - Wikipedia

    en.wikipedia.org/wiki/Undecimal

    That is, fractions aren't difficult to compare if the numerator is 1 (e.g., 1 ⁄ 2 is larger than 1 ⁄ 3, which in turn is larger than 1 ⁄ 4). However, comparisons become more difficult when both numerators and denominators are mixed: 3 ⁄ 4 is larger than 5 ⁄ 7 , which in turn is larger than 2 ⁄ 3 , though this cannot be determined by ...

  7. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    Like the decimal base 10, the base is a semiprime, though it is unique as the product of the only two consecutive numbers that are both prime (2 and 3). As six is a superior highly composite number , many of the arguments made in favor of the duodecimal system also apply to the senary system.

  8. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  9. GE-600 series - Wikipedia

    en.wikipedia.org/wiki/GE-600_series

    Half-word (18-bits), word (36-bits) and double-word (72-bits) operands were supported. Multiply and divide instructions were provided which would treat the operand as a binary fraction rather than an integer. Binary floating-point data could be single precision (36 bits) or double precision (72 bits). In either case the exponent was eight bits ...