So the question I have is this. How did the centimeter become so dominant in American metrication? I think it's more compatible with "inch-type thinking", since the basic unit is some fraction of an inch and it still allows you to think in terms of "one" of something. Millimeters is a more radical departure, where the basic unit is 100 mm and you think of either "percentages" of 100 mm or "modules" of 100 mm stacked together. Little more of a learning curve, but far easier when you get used to it. My usual class handout attached. Nat
Everyday_Millimeters.pdf
Description: Adobe PDF document
