In grade school for me (late 70s) we were taught that soon the US would be switching to metric, so this was VERY important for us to know.
Then in Jr. High, metric was used for the sciences, taught as something everyone was using and we would someday switch to metric all around.
Sr. High, metric was used only for sciences, taught as being best to do things the way everyone else was.
I'm curious about England and metric/imperial/whatever... It's so common to hear Brits talk about weight in Stone and distance in Miles. Do they use Fahrenheit or Celsius for temp? Gallons or Liters for gasoline/benzine/petrol?