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Ellipsis: Informally, repeating decimals are often represented by an ellipsis (three periods, 0.333...), especially when the previous notational conventions are first taught in school.

The number sign (#) is a typographical symbol that represents the word ?number? in American English and in Canada. Generally placed immediately before a number or series of digits (with no spaces), it also is known by many other names and offers various other uses.

For example, since the numeral 1 is doing all the repeating in the decimal 0.1111?, this tip tells us that the equivalent fraction must have a numerator of 1 and a denominator of 9. In other words, 0.1111? = 1/9.

Repeating decimals are decimals in which a digit or a group of digits after the decimal point repeats indefinitely and at regular intervals such that the decimal representation becomes periodic. Repeating decimals are also known as ?recurring decimals.?

Because the number 1 is repeated in the preceding example, it can be expressed as. 1 ¯ . The bar notation is indicated by the line above number 1. It can also be said that the line over a number means that the number is being repeated.

(9)) is a notation for the repeating decimal consisting of an unending sequence of 9s after the decimal point. This repeating decimal is a numeral that represents the smallest number no less than every number in the sequence (0.9, 0.99, 0.999, ...); that is, the supremum of this sequence. This number is equal to 1.

The number sign, or #, is a symbol which is representative of the word ?number? in the United States and Canada. It is usually used just before an actual numeral or number, and is sometimes known as the pound sign.