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FX 260 Training guide
Tools FX 260 Solar Scientific Calculator
Overhead OH 260
Handouts Applicable activities
Key Points/
Overview
Basic scientific calculator
Solar powered
Ability to fix decimal places
Backspace key to fix entry mistakes
Single variable statistics
The
ONLY calculator that is GED approved
Content
Modes
Basic Arithmetic Calculations
Basic Functions and Operations
Basic Calculations
Constant Calculations
Fraction calculations and simplification
Percent calculations
Powers and roots
Internal Rounding
Probability
Random number generation
Permutations and combinations
Factorials
Memory
Memory Calculations
Trigonometry
Trigonometric/Inverse Trigonometric Functions
Hyperbolic/ Inverse Hyperbolic Functions
Coordinate Conversion
Sexagesimal Functions (Degrees/Minutes/Seconds)
Logarithmic Functions
Statistics
Entering and analyzing statistical data
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Modes
Before starting a calculation, you must first enter the correct mode.
To perform this type of
calculation:
Basic arithmetic calculations [MODE] [0] COMP
Standard deviation calculations [MODE] [.] SD
Calculations using degrees [MODE] [4] DEG
Calculations using radians [MODE] [5] RAD
Calculations using grads [MODE] [6] GRA
Number of decimal place
specification
Number of significant digit
specification
Cancels FIX and SCI settings [MODE] [9] NORM
• Display indicators show the current mode setting. If there is no display shown,
this indicates COMP mode.
• The COMP and SD modes can be used in combination with the angle unit
settings.
Perform this key
operation:
[MODE] [7] [x]
(x = # of decimal places and
ranges from 0 – 9)
[MODE] [8] [x]
(x = # of significant digits and
ranges from 0 – 9)
Name of mode:
FIX
SCI
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Basic Arithmetic Calculations
Basic Functions and Operations
The following are the basic functions and operations of the calculator.
Backspaces and deletes the right digit of a displayed input value.
[ON] Turns power on.
[C] Clears the displayed input value.
[SHIFT] Shifts the keyboard and accesses functions marked above the keys.
Note: There is no power off key.
Basic Calculations
Be sure to press [AC] when beginning a new calculation.
[+] [ - ] [x] [÷] Addition, subtraction, multiplication, and division
[=] Performs calculation
[+/-] Changes the sign of a displayed value. You must enter the value
first.
[(] [)] Left and right parentheses. Note: The calculator uses “order of
operations”. So for 2 + 3 x 4, you do not need parentheses around
3 x 4. The calculator will calculate 3 x 4, then add 2.
[SHIFT] [π] This will input the numerical value for π.
[SHIFT] [X-Y] Swaps the value of x and y in power and root calculations. Also
swaps the minuend and subtrahend in subtraction calculations.
Example: for 3
The answer displayed is 8.
2
, to swap 3 and 2, press [3] [xy] [2] [SHIFT] [X- Y ] [= ].
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Constant calculations
You can perform “constant” calculations by setting an automatic constant to continually
add, subtract, multiply, or divide. Pressing [+], [ - ], [x], or [÷] twice after inputting a
number, will make that number a constant. “K” will be shown on the display, indicating
that a constant is being used.
For addition, enter [constant] [+] [+]. When you press [=], the constant will be added to
the number on the display. Pressing [AC] clears the constant.
Display
For example: [2] [+] [+] [=] 4
Each time you press [=], it will add 2 to the displayed number
[3] [+] [+] [4] [=] 7
[5] [=] 8
[10] [=] 13
Fraction calculations and simplification
• Use the COMP mode for fraction calculations.
• 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.
• You can enter a fraction using the [a b/c] key.
• The total number of digits, including division marks, cannot exceed 10.
Be sure to press [AC] when beginning a new calculation.
[a b/c] Inputs the integer part of a fraction (mixed number) and the numerator
Example: to input ½ , press [1] [a b/c] [2].
Example: to input 2 ½, press [2] [a b/c] [1] [a b/c] [2].
[SHIFT] [d/c] Converts the displayed value between mixed number and improper
fraction.
[a b/c] Converts the displayed value between fraction and decimal form.
NOTE: After entering a fraction using a b/c, pressing [=] will display it in simplest form.
(b) /denominator (c) of a fraction in the form b/c.
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Percent calculations
• Use the COMP mode for percentage calculations.
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
% change, when a value is increased
From 30 to 36 [36] [ - ] [30] [SHIFT] [%] 20
Percent of increase, when an amount is added.
300 cc is added to 500 cc [300] [+] [500] [SHIFT] [%] 160
Powers and roots
2
x
] Squares a number. Example: [5] [
[
[SHIFT] [x
3
] Cubes a number. Example: [3] [SHIFT] [x3]
y
[
]
x
Example: [2] [x
[SHIFT] [1/x] Calculates the reciprocal of the displayed value.
Example Display
2
x
]
Raises a number to a power (other than 2 or 3).
y
] [4] [=]
Example: [3] [SHIFT] [1/x]
[SHIFT] [
] Calculates the square root of a number.
Example: [9] [SHIFT] [
[SHIFT] [3
] Calculates the cube root of a number.
Example: [27] [SHIFT] [
[SHIFT] [x
1/y
] Calculates the specified root of a number.
Example: For 27
References the Casio FX-260 Solar User’s Guide Casio FX-260 Scientific calculator
]
3
]
1/3
, press [27] [SHIFT] [x
5
1/y
] [3] [=]
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Internal Rounding
Calculates internal rounding based on the number of decimal places you have on the
display. For example, set the calculator to 3 fixed decimal places.
Press [200] [÷] [7] [=]
Press [SHIFT] [RND]. This will truncate the number at 3 decimal places.
Press [x] [14] [=]
(The answer displayed is 399.994).
Probability
Random number generation
[SHIFT] [RAN#] Generates a random number between 0 and 0.999.
Permutations and combinations
[SHIFT] [nPr] A permutation is a selection of objects in which the order matters.
Example: To determine the number of possible different
[10] [SHIFT] [nPr] [4] [=] 5040
[SHIFT] [nCr] A combination is a selection of objects from a collection and order
Example: To determine the number of different combinations of 4
Factorials
[SHIFT] [x!] Calculates the factorial of a number. Example: [5] [SHIFT] [!]
arrangements using 4 items selected from 10 items.
is irrelevant.
items selected from 10 items. [10] [SHIFT] [nCr] [4] [=] 210
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Memory
Memory Calculations
The memory function is convenient for calculating cumulative totals.
[M+] Adds displayed value to memory.
[MR] Recalls the value stored in memory.
[SHIFT] [M-] Subtracts the displayed value from memory.
[SHIFT] [Min] Replaces the current memory contents with the displayed value.
To clear memory, press [0] [SHIFT] [Min] or [AC] [SHIFT] [Min].
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Trigonometry
Be sure to select the angle unit (D, R, G) you want to use before beginning a calculation.
Mode 4 = Degrees (Deg)
Mode 5 = Radians (Rad)
Mode 6 = Grads (Gra)
Trigonometric/Inverse Trigonometric Functions
To calculate the sine, cosine, or tangent of the displayed angle.
Example (in degree mode): [30] [sin] (= .5)
To calculate the arcsine, arccosine, or arctangent.
Example (in degree mode): [.5] [SHIFT] [sin] (= 30)
Hyperbolic/ Inverse Hyperbolic Functions
To calculate the hyperbolic sine, cosine, or tangent of the displayed angle.
Example (in degree mode): [3.6] [hyp] [sin] (= 18.28545536)
To calculate the hyperbolic arcsine, arccosine, or arctangent of the displayed angle.
Example (in degree mode): [30] [hyp] [SHIFT] [sin
[30] [SHIFT] [hyp] [sin
-1
] OR
-1
] (= 4.094622224)
Coordinate Conversion
You can convert between rectangular and polar coordinates.
Make sure you are using the correct angle unit (D, R, G) before starting your calculation.
[SHIFT] [R-P] Rectangular to polar coordinate conversion
[SHIFT] [P-R] Polar to rectangular coordinate conversion
[SHIFT] [X-Y] Use this operation to switch between the two coordinates produced by the
conversion operation.
Example: To convert polar coordinates (r = 2, θ = 60) to rectangular
coordinates (x, y).
[2] [SHIFT] [P-R] [60] [=] This gives you the x value.
[SHIFT] [X-Y] This gives you the y value.
Degrees/Minutes/Seconds
You can perform calculations using degrees, minutes, and seconds, and convert
between sexagesimal and decimal values.
Examples:
Keystrokes Display
[2.5] [=] 2.5
,,,o
Press [
[10] [
] 2° 30° 0
,,,o ,,,o ,,,o
] [15] [ ] [12] [ ] [x] [4] [=] 41° 0° 48°
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Logarithmic Functions
You can find logarithms, natural logarithms, and antilogarithms.
[log] Calculates the common logarithm of the displayed value.
[100] [log]
[ln] Calculates the natural logarithm (base e) of the displayed value.
[90] [ln]
[SHIFT] [10
[2] [SHIFT] [10
[SHIFT] [e
[1] [SHIFT] [e
x
] Calculates the common antilogarithm of the displayed value,
x
] Calculates the natural antilogarithm of the displayed value, which
which is 10 raised to the power of the value.
is e raised to the power of the value.
x
]
x
]
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Statistics
Entering and analyzing statistical data
Enter the statistics mode (SD) by pressing [MODE] [.].
Cancel FIX and SCI settings by pressing [MODE] [9].
Pressing [MODE] [0] (Comp) exits the SD mode and clears all input data.
[SHIFT] [SAC] Clears statistical memory. Be sure to perform this operation
before inputting new data.
[DATA] I nputs the displayed value as data. Press [DATA] twice to input
two entries of the same value. (NOTE: This is the “M+” key).
[SHIFT] [DEL] Deletes the displayed value as data.
Note: You can input multiple entries of the same data using [x].
To input 100 ten times, press [100] [x] [10] [DATA]
After entering data, you can retrieve the following values:
-1
[SHIFT] [σ n
] Sample standard deviation.
[SHIFT] [σ n] Population standard deviation.
x
[SHIFT] [
] Arithmetic mean.
[SHIFT] [n] Number of data items.
[SHIFT] [∑x] Sum of data.
2
[SHIFT] [∑x
] Sum of the squares.
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