PERCENTAGE CALCULATIONS
The Percent key can find a percent of a number,*
add a percent to a number, subtract a percent
from a number or divide a number by a percent.
You do not need to press the Equals key to
complete a percentage calculation.
Computing Percentages
1. Find 18% of 500 feet:
500 [Feet] [x] 18 [%] 90 FT 0 IN
2. Add 10% for waste to 137 square feet:
137 [Sq] [Feet] [+] 10 [%] 150.7 SQ FT
3. Take 20% away from 552 feet 6 inches:
552 [Feet] 6 [Inch] [–] 20 [%] 442 FT 0 IN
4. Divide 350 cubic yards by 80%:
350 [Cu] [Yds] [÷] 80 [%] 437.5 CU YDS
You can also find a percentage by dividing one
number by another. These may also be dimen-
sioned or non-dimensioned numbers, but in such
cases you would not use the Percent key.
1. Find what percent 13 is of 75:
13 [÷] 75 [=] .173333 (or 17.3%)
2. 20 feet 8 inches is what percent of 34 feet 3
7/8 inches?
20 [Feet] 8 [Inch]
[÷] 34 [Feet] 3 [Inch] 7 [/] 8
[=] .602124 (or 60.2%)
* The Percent key works with dimensions as well.
18 — Construction Master III
®
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