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In many contexts, when a number is spoken, the function of the separator is assumed by the spoken name of the symbol: comma or point in most cases. [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 general, digits should be grouped and separated either by commas or by narrow gaps (never a period/full point). Grouping with commas Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. 12,200; 255,200 km; 8,274,527th; 1 ⁄ 86,400). Numbers with exactly four digits left of the decimal point may ...
[8] [1] The word period was used as a name for what printers often called the "full point", the punctuation mark that was a dot on the baseline and used in several situations. The phrase full stop was only used to refer to the punctuation mark when it was used to terminate a sentence. [ 1 ]
2. Denotes that a number is positive and is read as plus. Redundant, but sometimes used for emphasizing that a number is positive, specially when other numbers in the context are or may be negative; for example, +2. 3. Sometimes used instead of for a disjoint union of sets. − 1.
Like English and other locales, the Indian system uses a period as the decimal separator and the comma for grouping. Some Western numbering systems use a comma for decimal separator and a thin space or point to group digits. [3]
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Organizers of the Times Square New Year's Eve celebration screwed the last crystals onto the ball before it ushers in the new year one last time.
Conversely the period of the repeating decimal of a fraction c / d will be (at most) the smallest number n such that 10 n − 1 is divisible by d. For example, the fraction 2 / 7 has d = 7, and the smallest k that makes 10 k − 1 divisible by 7 is k = 6, because 999999 = 7 × 142857. The period of the fraction 2 / 7 is ...