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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.
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[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
Example Display
To find percentage of a number.
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