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I surely remember those days!! I was no 'dummy' (straight A student) and I never 'got' the metric system. We were told it was the 'up and coming' thing and in a couple of years the whole country would be going metric so we needed to buck up and learn the stuff.
With today's education indoctrination system, the kids have trouble with fairly simple reading, writing & 'rithmentic .... I can't imagine a good number of them learning metrics. Also, with the way Common Core butchers math, I can only imagine how impossible CC would make learning metrics.
I remember the morning news on WTAE-TV in Pittsburgh would give us daily drills on converting Farenheit to Celsius to prepare us for the coming Metric weather forecasts.
I remember in the early 1990’s when I worked for a rental truck company, we had a truck come in from Canada and I had to tell them how to convert kilometers into miles so we could figure out the bill.
You didn't understand multiples of ten?