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The opposite of a number is the number on the other side of 0 on the number line, and the same distance from 0 on the number.

The opposite of a positive integer is a negative integer. So, the opposite of the integer +52 is −52.

An integer and its opposite are the same distance (in the opposite directions) from 0 (zero) on the number line.

For example, – 12 and 12 are opposites, and the same distance from (zero) on the number line.

The opposite of a number is the number on the other side of 0 (zero) on number line, and the same distance from 0

Example on number line:

$-  4  $is the opposite of $4$:

3 is opposite of $-  3  $

The absolute value of a number means the distance from zero that a number is on the line without considering the sign (positive or negative) of the number.

The absolute value of a number is always positive.

Find the opposite of an integer of 18.

According to the question, find the opposite of integer of 18.

The opposite of a number is the number on the other side of $0$(zero) on a number line, and the same distance from $0$(zero). Both the numbers have the same absolute value but different signs.

Rule: The opposite of negative ‘$-$’ is positive ‘$+$’, or opposite of positive ‘$+$’ is negative ‘$-$.

Therefore, the opposite of $18  \text{is}  -  18.$