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A number line is a one-dimensional graph. It is often used as an aid in teaching simple addition or
subtraction, especially involving negative numbers.
The number line is most often represented as being horizontal (though it
need not be so). It is divided into two symmetric halves by the origin, i.e. the number
zero. Customarily, positive numbers lie on
the right side of zero, and negative numbers lie on the left side of zero (though it need not be so).
See also: real number, extended real number line.
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