If a is the positive number then |a| = a.

So, |7| = 7.

If a is negative, then |a| = - a.

|- 3| = - (- 3) = 3

If ab is negative, then |ab | is - ab .

|- 37| = - (- 37) = 37.

Let a be the number.

a = 0.8.

If a is positive, |a| = a.

|0.8| = 0.8.

The absolute value of ab is ab, if ab > 0.

If a is negative, then |a| = - a.

- |- 25| = - [- (- 25)] = - 25.

If a is a positive number, then | a | = a.

So, | 5 | = 5.

If  ab is negative, then | ab | is - ab.

| - 25 | = - (- 25) = 25

Let a be the number.

a = 2.1

If a is positive, then | a | = a.

Therefore, | 2.1 | = 2.1

Let a be the number.

a = - 0.5

If a is negative, | a | = - a.

| - 0.5 | = - (- 0.5) = 0.5

The absolute value of  ab is   ab, if  ab > 0.

- | 25 | = - 25

If a is negative, then | a | = - a.

- | - 511 | = - [ - (- 511)] = - 511

If a is negative, then | a | = - a.

The absolute value of a number is its distance, in either direction, from zero on a number line.

Represent zero on the number line.

On the number line, 36 is 36 units away from 0. So, |36| = 36.

Opposite of 25 is -25 and the absolute value of -25 is 25.