# Round number

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Round number

Generally speaking, a round number is a number that ends with one or more zeroes (0), meaning that they are multiples of 10, 100, 1000, and so on. There are variations on this theme, where multiples of 5 or 25 might also be considered "round." When counting and measuring, people often view the rollover to a round number as something of great importance. For example, a family might gather in their automobile to view the moment the vehicle's odometer goes from 49,999 to 50,000 or 99,999 to 100,000. A rollover that adds another digit is often seen as particularly exciting. A similar fascination led people around the world to celebrate a new millennium at the beginning of the year 2000, even though the event wouldn't really occur until the end of that year and the beginning of 2001.

Numbers can also be considered as "round" in numbering systems other than decimal (base 10). For example the number 32 is not round in decimal, but ends with zero in several bases including binary and hexadecimal.

(Note: MathWorld gives an entirely different definition of "Round Number" : the product of a considerable number of comparatively small factors) [ [http://mathworld.wolfram.com/RoundNumber.html MathWorld's definition of a round number] ]

ee also

*Unix billennium
*Rounding

References

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• round number — phrase a number that ends in 0, such as 40, 450, or 4000 in round numbers: I don’t need an exact figure. Just tell me what it will cost in round numbers. Thesaurus: numbers and types of numberhyponym Main entry: number * * * round number …   Useful english dictionary

• round number — number that has been evened off to the nearest whole number …   English contemporary dictionary

• round number — a number that ends in 0, such as 40, 450, or 4000 in round numbers: I don t need an exact figure. Just tell me what it will cost in round numbers …   English dictionary

• round number — noun a) a number whose decimal representation ends in one or more zeroes b) a rough approximation, especially one whose decimal representation ends in one or more zeroes …   Wiktionary

• round — round1 [round] adj. [ME < OFr roont < L rotundus: see ROTUND] 1. shaped like a ball; spherical; globular 2. a) shaped like a circle, ring, or disk; circular b) shaped like a cylinder (in having a circular cross section); cylindrical 3 …   English World dictionary

• Round — or rounds can mean:* The shape of a circle or sphere * Rounding (sediment), the smoothness of a sediment particle * Roundedness, the roundedness of the lips in the pronunciation of a phoneme * Rounding, the truncation of a number to reduce the… …   Wikipedia

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