en.wikipedia.org/wiki/Absolute_value

In mathematics, the absolute value or modulus |x| of a real number x is the non- negative value of x without regard to its sign. Namely, |x| = x for a positive x, |x| ...

www.mathsisfun.com/numbers/absolute-value.html

More Examples: The absolute value of −9 is 9; The absolute value of 3 is 3; The absolute value of 0 is 0; The absolute value of −156 is 156 ...

www.khanacademy.org/math/algebra-basics/basic-alg-foundations/alg-basics-absolute-value-new/v/absolute-value-and-number-lines

One easy way to think of absolute value is the distance it is from zero. To do that, a number line comes in handy. Watch and learn.

www.coolmath.com/algebra/18-absolute-value-equations-inequalities/01-absolute-values-01

Before we start sticking a bunch of x's in these things, let's remember what they are. Look at a few examples:

www.purplemath.com/modules/absolute.htm

There is a technical definition for absolute value, but you could easily never need it. (If you go as far as calculus, the technical definition might come up.) For now ...

www.purplemath.com/modules/solveabs.htm

Demonstrates how to solve absolute-value equations, and explains the reasoning behind the algebra. Also compares algebraic results with graphical results.

www.varsitytutors.com/hotmath/hotmath_help/topics/absolute-value

The absolute value of a number is its distance from zero on a number line. The absolute value of x is written as |x|. For instance, 4 and -4 have the same absolute ...

www.brainpop.com/math/numbersandoperations/absolutevalue

In this educational animated movie about Math learn more about the value of numbers and their distance from zero.

www.eduplace.com/math/mathsteps/7/b

Absolute value describes the distance of a number on the number line from 0 without considering which direction from zero the number lies. The absolute value ...