Been ages since I was in a math class and I misquoted why it’s useful. It’s not that it is rational, as 10/3 is also rational. However, 10/3 is not an integer, and therefore cannot be found on a measuring stick or tape measure. There are projects where being able to divide into exact thirds, 6ths, etc are required, and metric is not as useful for that. In a country that also uses imperial interchangeably, it makes sense to use it with projects that are better served with imperial.
Been ages since I was in a math class and I misquoted why it’s useful. It’s not that it is rational, as 10/3 is also rational. However, 10/3 is not an integer, and therefore cannot be found on a measuring stick or tape measure. There are projects where being able to divide into exact thirds, 6ths, etc are required, and metric is not as useful for that. In a country that also uses imperial interchangeably, it makes sense to use it with projects that are better served with imperial.