Difference between revisions of "Number"
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(New page: A '''number''' is a term that describes the amount of something. A number may be even (divisible by two) or odd (not divisible by two), positive (more than nothing) or negative (less than ...) |
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Revision as of 22:28, June 21, 2007
A number is a term that describes the amount of something. A number may be even (divisible by two) or odd (not divisible by two), positive (more than nothing) or negative (less than nothing), whole (undivided) or fractional (divided into smaller parts), and various other classifications, such as prime (only divisible by itself and one).
Numbers are usually represented in English writing by a system of numerals:
- 0 (zero)
- 1 (one)
- 2 (two)
- 3 (three)
- 4 (four)
- 5 (five)
- 6 (six)
- 7 (seven)
- 8 (eight)
- 9 (nine)
Which can be used in combination to represent any number of any size. An older system of representation, still sometime encountered on clocks and other places, is Roman numerals, which used certain letters of the alphabet instead.