What is the distance between 178 and 313 on a number line some one me

The distance between 178 and 313 on a number line is:  135

We know that the distance between two points a and b on a number line is equal to the absolute difference between the two numbers.

i.e. Distance between two numbers = |a-b|

Here we have:

a= 178

and b=313

This means that:

|a-b|=|178-313|=|-135|=135

were is the equation