Draw a line. Mark a point on it and label it as '0'. Set off equal distances on both sides of the point representing '0'.
Label the points lying on the right of '0' as 1, 2, 3, 4, 5, . . .
and those lying on the left of '0' as –1, –2, –3, –4, –5, . . .
The arrowheads on both sides of the number line indicate the continuation of integers indefinitely on each side.
Absolute value of an integer:
The absolute value of an integer is the numerical value without regard to whether the sign is negative or positive.
Ex: The absolute value of +21 is 21 and the absolute value of –21 is also 21.
On a number line, the absolute value is the distance between the number and zero (0).
The symbol for absolute value is two vertical bars on either side of the number such as | -7 | = 7
Note: Read "| -7 | = 7" as "absolute value of -7 is 7".