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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).
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 ...
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 ...
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]
n·h, pronounced [n.h], versus nh, pronounced [ɲ], for example in in·hèrn 'hell' vs vinha 'vineyard' Although it is considered to be a spelling error, a period is frequently used when a middle dot is unavailable: des.har, in.hèrn, which is the case for French keyboard layout.
The comma, is a punctuation mark that appears in several variants in different languages. Some typefaces render it as a small line, slightly curved or straight, but inclined from the vertical, others give it the appearance of a miniature filled-in figure 9 placed on the baseline.
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In mathematics, the symbol × has a number of uses, including Multiplication of two numbers, where it is read as "times" or "multiplied by" [1] Cross product of two vectors, where it is usually read as "cross" Cartesian product of two sets, where it is usually read as "cross" [7]