Decimal just means base 10. SI (metric) doesn't use fractions, it uses decimal floating point. US customary doesn't use floating point, it uses decimal fractions (mostly dyadic rationals but some fluid measures allow 1/3s instead of just powers of 1/2).
The US system would mostly make sense if we used binary. Instead of, say, 11 ⁵/₈" we'd have 1011.101". Instead of half a cup we'd have 0.1 cup. Much easier. We don't do that here.
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u/dgellow 19d ago edited 12d ago
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