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Scatter plots, line graphs, pies and bar charts.
We use line number in maths subject.
You do not use a number line to find a ratio
Well a straight line is something that you use in geometry and that is what you use to measure with.
It depends on what you want to show on the number lines. You could do it in Hundredths, Ones, Twenties or even Millions. There is an unlimited number of intervals you can use.