The biggest advantage and disadvantage of the metric system is the decimal part!

I'm serious! Doing math with the metric system (or even 100ths of inches like we do in machining) is great - with measuring tools

Now - I give you a sheet of paper - let's say I want you to fold it into 10ths - good luck - In the mean time, I'll give you a fraction of 2 easily (and computers like binary...)

Some of those "odd ball" measurements are "english" 10x measurements - for instance - 1 acre is 10 square chains - and 10 chains = 1/8th of a mile. At least around here, a "standard" street is 66ft wide - aka 1 chain

BTW 10 chains = 1 furlong - so one furlong X 1 chain = 1 acre, or 1 furlongx1furlong = 10 acres

It all comes down to logical devision of square miles (sections) into smaller units - or even "townships" (36 square miles)