I remember when I was at school the first day of woodwork class (age around 10) we were told that all measurements were in millimetres. I don't think anybody h

I remember when I was at school the first day of woodwork class (age around 10) we were told that all measurements were in millimetres. I don't think anybody had problems adjusting. It was just another thing to remember in class. Outside the class everybody used mm/cm/m/km as needed (nobody used dm where I lived).