I'm sure that's why we were better at mental arithmetic (as it was then called - is the term still in use at schools today?) in those days.
We also had to master 16 ounces in a pound, 14 pounds in a stone, 8 stone or 112 pounds in a hundredweight (work that one out), 20 hundredweight in a ton.
Then there was 12 inches in a foot, 3 feet in a yard, 1,760 yards in a mile, not to mention the lesser-used chains (22 yards), furlongs (220 yards) and fathoms (6 feet).
(Guineas and furlongs still quite familiar in horse racing circles I believe.)
I have only covered the main ones commonly in use in my youth, there were others like rod, pole, perch, league, etc.
All this gave us a numerate acuity sadly absent today. Nowadays the only non-decimal figures that the moderns have to cope with is 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 28,29,30, or 31 days in a month, 12 months or 365(or 366) days in a year. A major task to decimalise that.
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