TapeMath
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7/16" + 7/16"

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

7/16" + 7/16" =
=0-7/8"
Sum
0-7/8"
Decimal inch
0.875"
Millimetres
22.225 mm
7/16" − 7/16"
0"
The work

Over a common denominator

Put both over 16: 7/16 = 7/16 and 7/16 = 7/16. Add the tops: 7/16 + 7/16 = 14/16. Reduced, that's 0-7/8" (0.875 inches). TapeMath tracks it as an exact fraction, so it lands dead on the tape mark.
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