There are many situations where it is not necessary to give an exact number. For example, if there are \(54785\) people living in a town, you could say that the population is approximately \(55000\). ...

Humans are remarkably good at estimating magnitudes. For example, we can estimate the amount of time it will take us to drive from point A to point B, so we know what time we should leave. We estimate ...

We can use significant figures to get an approximate answer to a problem. We can round off all the numbers in a maths problem to \(1\) significant figure to make 'easier' numbers. It is often possible ...