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  2. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    A decimal point may be placed after the number; for example "1300." indicates specifically that trailing zeros are meant to be significant. [7] As the conventions above are not in general use, the following more widely recognized options are available for indicating the significance of number with trailing zeros:

  3. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    [6] [2] [7] In some specialized contexts, the word decimal is instead used for this purpose (such as in International Civil Aviation Organization-regulated air traffic control communications). In mathematics, the decimal separator is a type of radix point, a term that also applies to number systems with bases other than ten.

  4. Derangement - Wikipedia

    en.wikipedia.org/wiki/Derangement

    For instance, for a word made of only two different letters, say n letters A and m letters B, the answer is, of course, 1 or 0 according to whether n = m or not, for the only way to form an anagram without fixed letters is to exchange all the A with B, which is possible if and only if n = m.

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The apparent plural form in English goes back to the Latin neuter plural mathematica , based on the Greek plural ta mathēmatiká (τὰ μαθηματικά) and means roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of ...

  6. The repeating decimal commonly written as 0.999... represents exactly the same quantity as the number one. Despite having the appearance of representing a smaller number, 0.999... is a symbol for the number 1 in exactly the same way that 0.333... is an equivalent notation for the number represented by the fraction 1 ⁄ 3 .

  7. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It adopts the form of the upper deck one bead and the bottom four beads. The top bead on the upper deck was equal to five and the bottom one is similar to the Chinese or Korean abacus, and the decimal number can be expressed, so the abacus is designed as a 1:4 device. The beads are always in the shape of a diamond.

  8. Scrabble letter distributions - Wikipedia

    en.wikipedia.org/wiki/Scrabble_letter_distributions

    However, with this set, according to the rules, if a blank is used as a Y it is worth 10 points, if a blank is used as a Z it is worth 15 points, and if a blank is used as a K it is worth 20 points. Each of those letters are so high in points, because they are used only in borrowed words.

  9. Binary prefix - Wikipedia

    en.wikipedia.org/wiki/Binary_prefix

    For example, the IBM 701 (1952) used a binary methods and could address 2048 words of 36 bits each, while the IBM 702 (1953) used a decimal system, and could address ten thousand 7-bit words. By the mid-1960s, binary addressing had become the standard architecture in most computer designs, and main memory sizes were most commonly powers of two.