Delta FX 65 manual Being used appears on the display for a moment, followed by

FX 65 Training guide

Fraction calculations and simplification

•You can perform addition, subtraction, multiplication, and division.

•The result of a calculation that mixes fractions and decimal values is displayed as a decimal value.

•Using the [b/c] key, you can enter a fraction with up to 4 digits in both the numerator and denominator.

•Results can have up to four digits each for integer, numerator, and denominator. If any part is longer, value is displayed as decimal with error symbol E.

Be sure to press [AC] when beginning a new calculation.

[b/c]	Inputs the numerator (b) /denominator (c) of a fraction in the form b/c.
	Example: to input ½ , press [1] [b/c] [2].
[a]	Inputs the integer part of a fraction (mixed number).
	Example: to input 2 ½, press [2] [a] [1] [b/c] [2].
[SHIFT]	Converts the displayed value between mixed number and improper
[a b/c – d/c]	fraction.
[=]	When “SIMP” is displayed, pressing [=] will reduce the fraction to its
	simplest form.
[SIMP]	Simplifies a fraction by the smallest divisor possible. The divisor
	being used appears on the display for a moment, followed by the
	simplified fraction.
n [SIMP]	Simplifies a fraction by a specific divisor.
	Example: 50 [b/c] [100] [=]
	Press [5] [SIMP]. The fraction is reduced to 10/20.
[F-D]	Converts the displayed value between fraction and decimal form.

Percent calculations
To find percentage of a number.	Example	Display
12% of 15	[15] [x] [12] [SHIFT] [%]	1.8
To calculate percentage of one number to another.
What percentage of 80 is 40?	[40] [⎟] [80] [SHIFT] [%]	50
To add a percentage.
15% to 1000 (or 1000 increased by 15%)	[1000] [x] [15] [SHIFT] [%] [+]	1150
To discount a percentage.
85 by 10%	[85] [x] [10] [SHIFT] [%] [-]	76.5

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References the Casio FX-65 User’s Guide Casio FX-65 Fraction calculator