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1/16" + 3/16"

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" + 3/16" =

=0-1/4"

Sum

0-1/4"

Decimal inch

0.25"

Millimetres

6.35 mm

1/16" − 3/16"

-0-1/8"

The work

Over a common denominator

Put both over 16: 1/16 = 1/16 and 3/16 = 3/16. Add the tops: 1/16 + 3/16 = 4/16. Reduced, that's 0-1/4" (0.25 inches). TapeMath tracks it as an exact fraction, so it lands dead on the tape mark.

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