Re: English units and decimals
For engineering/machining drawings, decimals and fractions play a role in determining what the tolerance is when not directly specified for a dimension. Usually there's a tolerance block on the drawing that states something like
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UOS
All dimensions are in inches.
3 place decimal ± 0.001
2 place decimal ± 0.005
1 place decimal ± 0.01
Fraction ± 1/64
Angular = ± 0o30'
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Of course, tolerance blocks are a cop out since they're applied in blanket fashion to many different features, each of which very probably needs a looser or tighter tolerance. But that might involve actual design engineering work.
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