It shows multiple numbers in order to use in addition, subtraction, etc.
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In software, it is for human eyes. The line numbers have no meaning to computers.
We use line number in maths subject.
You do not use a number line to find a ratio
how to use number line to represent real life event
You see which tick is nearer to the point on the number line.
If you want to use a number line to add and subtract, it can be done with a slide rule. But it is much easier to use an electronic calculator.