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1/16" + 5/16"

Adding two fractions of an inch, exactly — the everyday jobsite arithmetic that a decimal calculator gets wrong. Reduced, carried, and shown in millimetres.

1/16" + 5/16" =

=0-3/8"

Sum

0-3/8"

Decimal inch

0.375"

Millimetres

9.525 mm

1/16" − 5/16"

-0-1/4"

The work

Over a common denominator

Put both over 16: 1/16 = 1/16 and 5/16 = 5/16. Add the tops: 1/16 + 5/16 = 6/16. Reduced, that's 0-3/8" (0.375 inches). TapeMath tracks it as an exact fraction, so it lands dead on the tape mark.

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