this post was submitted on 14 Aug 2024
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Anything that makes you apply your hand to your face.
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Even though fractions makes sense for accuracy in a mathematical point of view, I see no benefit in a practical application.
Fractions are easier to do calculations in your head or on paper than trying to do the same stuff in decimals. E.g. half of 1/2 is 1/4, half of 1/4 is 1/8, half of 1/8 is 1/16, half of 1/16 is 1/32 etc. In decimals this would be 0.5 -> 0.25 -> 0.125 -> 0.0625 -> 0.03125. When building stuff, I find it useful to be able to do that kind of stuff in my head easily.
Tell me you're American without telling me you're American.
:) I think British woodworkers also use fractional units.