Casio fx-991ES PLUS - Manual (Page 12)

E-11
Percent Calculations
Inputting a value and pressing (%) causes the input value to become
a percent.
150 s 150 20 (%) 30
Calculate what percentage of 880 is 660. (75%)
660  880 (%) 75
Increase 2500 by 15%. (2875)
2500
2500 15 (%) 2875
Discount 3500 by 25%. (2625)
3500 3500 25 (%) 2625
Degree, Minute, Second (Sexagesimal) Calculations
Performing an addition or subtraction operation between sexagesimal values,
or a multiplication or division operation between a sexagesimal value and a
decimal value will cause the result to be displayed as a sexagesimal value.
You also can convert between sexagesimal and decimal. The following
is the input format for a sexagesimal value: {degrees}
 {minutes} 
{seconds} .
Note: You must always input something for the degrees and minutes, even
if they are zero.
2°20´30˝ + 39´30˝ = 3°00´00˝
2  20  30 
0  39  30  3°0´0˝
Convert 2°15´18˝ to its decimal equivalent.
2  15  18  2°15´18˝
(Converts sexagesimal to decimal.)  2.255
(Converts decimal to sexagesimal.)  2°15´18˝
Multi-Statements
You can use the colon character (:) to connect two or more expressions and
execute them in sequence from left to right when you press
.
3 + 3 : 3 s 3 3
3 (:) 3 3 6
9
Using Engineering Notation
A simple key operation transforms a displayed value to engineering
notation.
Transform the value 1234 to engineering notation, shifting the
decimal point to the right.
1234 1234
$ 1.234Ч10 3
$ 1234Ч10 0