Hopefully the formatting doesn't get messed up in translation. I think that some of the spaces that I've added to get the columns to line up may disappear once I post it.
Just about everything I do is in CAD nowadays, so I don't need this nearly as often, but I came up with a way of adding feet, inches and fractions with a calculator. Essentially, feet go before the decimal point and inches come after the decimal point, except that things like 9" become .09. For instance, 8'-9" would become 8.09 and 8'-9 ¾" would become 8.0975. Here's an example.
before after
8'-9 ¾" 8.0975
4 ½" .045
17'-11" 17.11
28'-2 ¼" 28.0225
Of course, this all adds up to 53.275, or 53'-27 ½".
To fix that you take the result…
53.275
-.24 (minus 24")
+2.00 (plus 2'-0")
55.035 or 55'-3 ½"
I used to be able to do this pretty quickly on a calculator. I use this much less than I used to and I really do appreciate the accuracy of CAD.
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Daniel Lewis AIA
Northborough MA
www.DanielLewisArchitect.com------------------------------