The numerical value when direction or sign is not considered is called the absolute value. The absolute value of x is written  x. The absolute value of a number is always positive except when the number is 0.
 0  = 0 x  > 0 when x ≠ 0 – x > 0 when x ≠ 0
Example 1
Give the value.

4 = 4

–6 = 6

7 – 9 = –2 = 2

3 – –6 = 3 – 6 = –3
Note that absolute value is taken first, or work is first done within the absolute value signs.