>.Metric makes mistakes easier. I have never noticed that metric makes arithmetic easier. I have noticed that it makes not a bit of difference for practical purposes.<<
I guess it depends on what math you do - because with metric measurments you use powers of 10. Its a lot easier to for me to divide by 10 than by 12, for example.
Maybe so, but in reality it is highly unusual to divide by ten. Life should be so simple, but it isn't.