# Arithmetic/The Number Line

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The number line is a one-dimensional graph to show the relative positions of numbers. As you can see, as the line goes left, the numbers become smaller; as the line goes right, the numbers become larger. The line continues *infinitely* (without end) in *both directions*.

As you can see, the positive and negative numbers are of equal distance from the number zero. The distance of a number from zero is called the *absolute value*. The absolute value of a number is always positive or zero. It is represented by two lines on the left and right of a number.

- |-5| = 5
- |0| = 0
- |5 + 3| = |8| = 8
- 36 - |-55| = 36 - 55 = -19