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- DictionaryNum·ber line/ˈnəmbər līn/
noun
- 1. a line on which numbers are marked at intervals, used to illustrate simple numerical operations.
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noun
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In elementary mathematics, a number line is a picture of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely. The metaphorical association between numbers and points on the line links arithmetical o... Wikipedia