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Absolute value of any positive or negative number is always positive and equal to the magnitude of the number. The absolute value of a number N is denoted by $\left|N\right|$.

For example, the absolute value of 3 is denoted by $\left|3\right|$and is equal to 3.

And the absolute value of $−4$is denoted by $|−4|$and is equal to 4.

Opposite of any real number can be obtained by multiplying it with $−1$. On the number line, opposite of any number be located on the opposite side at the same distance from the midpoint 0.

For example, the opposite of the number $−5$ is 5.

The number 31 is at a distance of 31 units to the right of 0 on the number line.

So, the absolute value of the given number 31 is given by

$\left|31\right|=31$

Thus, the absolute value of the given number is 31.

In order to find the opposite of the number, multiply it with$−1$.

So, the opposite of the given number is

$−1\left(31\right)=−31$

Thus, the opposite of the number is $−31$.