This can cause confusion with the notation for standard uncertainty. Austria, Denmark, Finland, the Netherlands, Norway, Poland, Russia and Ukraine, as well as Vietnam and Israel, the convention is to enclose the repetend in parentheses.
Parentheses: In parts of Europe, incl. Dots: In some Islamic countries, such as Malaysia, Morocco, Pakistan, Tunisia, Iran, Algeria and Egypt, as well as the United Kingdom, New Zealand, Australia, South Africa, Japan, Thailand, India, South Korea, Singapore, and the People's Republic of China, the convention is to place dots above the outermost numerals of the repetend. Vinculum: In the United States, Canada, India, France, Germany, Italy, Switzerland, the Czech Republic, Slovakia, Slovenia, and Turkey, the convention is to draw a horizontal line (a vinculum) above the repetend. There are several notational conventions for representing repeating decimals. ( May 2022) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. Examples of such irrational numbers are √ 2 and π. Their decimal representation neither terminates nor infinitely repeats, but extends forever without repetition (see § Every rational number is either a terminating or repeating decimal). )Īny number that cannot be expressed as a ratio of two integers is said to be irrational. (This type of repeating decimal can be obtained by long division if one uses a modified form of the usual division algorithm. This is obtained by decreasing the final (rightmost) non-zero digit by one and appending a repetend of 9. However, every number with a terminating decimal representation also trivially has a second, alternative representation as a repeating decimal whose repetend is the digit 9. 1.585 = 1585 / 1000) it may also be written as a ratio of the form k / 2 n♵ m (e.g. Every terminating decimal representation can be written as a decimal fraction, a fraction whose denominator is a power of 10 (e.g. 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. The infinitely repeated digit sequence is called the repetend or reptend. Another example of this is 593 / 53, which becomes periodic after the decimal point, repeating the 13-digit pattern "1886792452830" forever, i.e. At present, there is no single universally accepted notation or phrasing for repeating decimals. A more complicated example is 3227 / 555, whose decimal becomes periodic at the second digit following the decimal point and then repeats the sequence "144" forever, i.e. 
For example, the decimal representation of 1 / 3 becomes periodic just after the decimal point, repeating the single digit "3" forever, i.e. all except finitely many digits are zero).
It can be shown that a number is rational if and only if its decimal representation is repeating or terminating (i.e. JSTOR ( July 2023) ( Learn how and when to remove this template message)Ī repeating decimal or recurring decimal is decimal representation of a number whose digits are periodic (repeating its values at regular intervals) and the infinitely repeated portion is not zero.Unsourced material may be challenged and removed.įind sources: "Repeating decimal" – news Please help improve this article by adding citations to reliable sources.
This article needs additional citations for verification. Converting recurring decimals - Higher Using dot notationĪ recurring decimal exists when decimal numbers repeat forever.
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