Well I'm building a table right now, and it was pretty easy to choose a size for a mortise and tenon in my 3/4" stock, a third of 3/4" is 1/4". If I wanted half its width, that's 3/8". Mental math is a lot easier than "What's a third of 19mm." In the wood shop, I rarely have to divide things by five or ten. I have to divide things by two, three and four a lot.
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