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1/4" + 3/4"

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

1/4" + 3/4" =

=1"

Sum

Decimal inch

Millimetres

25.4 mm

1/4" − 3/4"

-0-1/2"

The work

Over a common denominator

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

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