Key Functions

Press this key to start the calculator.When this key is pressed once after entering numbers, the last displayed number is cleared. Pressing this key twice in succession clears all the contents of the register except the memory contents. But, in the statistics mode, statistics register will not be cleared even if this key is pressed twice.

[OFF] Off Key

Press this key to turn off the calculator, and the readout disappears. The contents below are cleared when this key is pressed.

- Unfinished calculations
- The secondary function set up (INV)
- Error sign

The contents below are preserved if power is off.

- Independent memory contents
- Storage memory contents
- Statistics register contents
- Programs
- Operation mode
- Angular unit
- Indicating form

[INV]AC All Clear Key

Clears all the registers except the contents of independent memories, programming memories, and storage memories, and clears errors.

[MODE] Calculation Mode Key

Used with the [0] — [9] or [·] keys to set the calculation modes.

[MODE] [0] selects One-Variable Statistics Mode

“STAT 1” is displayed.

[MODE] [·] selects Two-Variable Statistics Mode

“STAT 2” is displayed.

[MODE] [1] selects Decimal Mode

“DEG” is displayed.

[MODE] [2] selects Binary Mode

“BIN” is displayed.

[MODE] [3] selects Octal Mode

“OCT” is displayed.

[MODE] [4] selects Hexadecimal Mode

“HEX” is displayed.

[MODE] [5] selects Complex Mode

“CPLX” is displayed.

[MODE] [6] selects Programming Mode 1

“LRN1” is displayed.

[MODE] [7] selects Programming Mode 2

“LRN 2” is displayed.

[MODE] [8] selects Programming Mode 3

“LRN 3” is displayed.

[MODE] [9] selects Programming Mode 4

“LRN 4” is displayed.

[INV] Inverse Key

Use this key to perform the secondary function of double-function keys. To execute these functions, press this key, and the corresponding key.

[INV] [Log] performing the secondary function — 10x

Example:

10x (x = 3)

You actually press keys [3] [INV] [LOG]. But the actual instruction says, “Operate [3] [INV]10x”. Press the [INV] key, and “INV” appears on the display. It is valid for one operation.

Pressing the [INV] key twice in succession clears “INV” and returns the key to its original function.

Example:

What is sin−1 0.5?

Operation: [·] [5] [INV]sin−1

[0] — [9] Number Keys

Select the number to be entered.

[·] Decimal Point Key

To enter decimals, press this key.

[EXP] Exponent Key

To enter an exponent, press this key after the mantissa has been entered.

[+/−] Sign Change Key

Changes the sign of the displayed number (mantissa and exponent).

[→] Right Shift Key

Shifts the entered number of mantissa or exponent to the right by one digit and clears the last digit. Used to correct the entered number one by one.

Example:

[π] Pi Key

Enters the value of π (3.141592654)

[INV]FLO, [INV]SCI, [INV]ENG Display Mode Keys

Display Mode Keys used to change the format of the calculation results. There are three types of display format as shown below.

[INV]FLO Floating Mode

[INV]SCI Scientific Exponential Mode

[INV]ENG Engineering Exponential Mode

Example:

Readout Limits

- Floating Mode

1010 ≤ |x| < 10100 Exponential Readout

10−99 ≤ |x| < 10−9 Exponential Readout

0 and 10−9 ≤ |x| < 1010

- Scientific Exponential Mode

0 and 10−99 ≤ |x| < 10100 All Region Exponential Readout

The mantissa part is always expressed as one-digit integer.

- Engineering Exponential Mode

0 and 10−99 ≤ |x| < 10100

The exponent is expressed as a multiple of 3, and the mantissa part is always smaller than 1,000. Effective when the units (ex. kilo (103) or micro (10−6) are used.

[INV]TAB Decimal Point Selection Key

Used to designate or change the number of digits beyond the decimal point to be displayed.

Press the [0] — [9] or [·] key after this key.

[INV]TAB [0] designates 0 decimal place.

[INV]TAB [1] designates 1 decimal place.

[INV]TAB [9] designates 9 decimal places.

[INV]TAB [·] cancels the decimal designation.

- Decimals are shown, after counting fractions over 1/2 as one and disregarding the rest. But the complete value is preserved in the calculator.

Example:

Decimal designation and change

When the integer portion is large, the integer portion is displayed prior to the designated decimal places.

[DRG] Angle Unit Selection Key

Used to set the angle unit for a trigonometric calculation, or an inverse trigonometric calculation. The mode changes each time the [DRG] key is pressed.

╭DEG→RAD→GRAD╮

╰------------╯

[DEG] : selects Degree

[RAD] : selects Radian

[GRAD] : selects Grad

The relation among the three units

180° = πRAD = 200 GRAD

[INV]DRG‣ Angle Unit Conversion Key

Used to convert the displayed angle unit to another.

Example:

Change 12.34° to RAD and GRAD

[➛DEG] Degrees-Minutes-Seconds to Decimal Degrees Conversion Key

Used to convert sexagesimal numbers such as angles, seconds, or minutes, to decimal numbers.

- Sexagesimal (Degrees - Minutes - Seconds)

12. 34 56 78

Degree ----------------------------╯ | | |

Minute --------------------------------╯ | |

Second -----------------------------------╯ |

Fraction (Decimal Part of the second) -------╯

Example:

Convert 98° 56’ 23" 1 (Sexagesimal) to a decimal number.

[INV]➛DMS Decimal Degrees to Degrees-Minutes-Seconds Conversion Key

Used to convert decimal numbers to sexagesimal numbers. In the relation between Sexagesimal and Decimal:

- Decimal

23. 56789

Degree ------------------------------╯ |

Fraction (Decimal Part of the degree) -----╯

Example:

Convert 12.35678° (Decimal) to a sexagesimal number.

[hyp] Hyperbolic Function Key

To obtain hyperbolic functions, press the [hyp] key, and trigonometric key ([sin],[cos] or [tan]).

To obtain inverse hyperbolic function, press the [hyp] key, and the inverse trigonometric key ([INV]sin−1, [INV]cos−1 or [INV]tan−1).

Pressing of the [hyp] key once indicates “HYP” on the display, and pressing of this key again turns “HYP” off.

Example:

Operate the [hyp] key

(You can also operate 2.1 [INV] [hyp]cos−1).

[+], [−], [×], [÷], [=] Arithmetic Keys

Perform addition, subtraction, multiplication, division.

[yx] Power Key

Enter the number (y), press the [yx] key, enter the power (x), and press any one of the arithmetic keys: [)], [yx], [INV]x√y or [=].

[INV]x√y Universal Root Key

Enter the number (y), press the [INV]x√y key, enter the Universal Root number (x), and press any one of the arithmetic keys: [)], [yx], [INV]x√y or [=].

[a b/c] Fraction Key

Used to enter improper and mixed fractions.

To enter an improper fraction (a/b), operate the numerator (a), the [a b/c] key, and the denominator (b).

To enter a mixed fraction (a b/c); operate the integer (a), the [a b/c] key, the numerator (b), the [a b/c] key, and the denominator (c).

Example:

Enter an improper and a mixed fraction.

Up to 9 figures (6 for a numerator and 3 for a denominator) can be entered. Up to 3 figures (each for an integer, a numerator, and a denominator of a mixed fraction) can be entered, but the sum of the figures must be below 9. When the denominator is of more than 3 figures, by reduction to common denominator, the fraction is changed to a decimal value.

The [a b/c] key also converts the result of fractional calculation into decimal, or vice versa. And after the fraction has been converted to decimal, the fractional value is preserved in the calculator.

Example:

Convert the result of 1 2/3 + 4 5/6 to decimal.

[INV]d/c Mixed/Improper Fraction Conversion Key

Converts a mixed fraction to an improper fraction, or vice versa.

Example:

Convert 4 5/6 to the improper fraction.

[(], [)] Parentheses Keys

The [(] specifies the beginning of a parenthetical calculation; the [)] key specifies its end and performs the parenthetical calculation.

The [(], [)] keys can be used continuously up to 15 times in one-level. Use of more than 15 times causes an overflow error. Up to 6 levels of operation instructions can be executed. More than 6 levels of operation instructions cause an overflow error. While the [(] key is effective, the readout displays “0.” and while the value is stored, “( )” is displayed.

[%] Percent Key

Used for percentage, discount, and add-on calculations.

[M+] Memory Plus Key

Used to add the displayed number to the independent memory contents (M+).

Note:

The independent memory M+ and the storage memory number 0 (S0) are the same memory.

[STO] Store Key

Used to store the displayed value into the specified storage memory. Press the [STO] key, and one of the [0] — [9] keys. The number of independent memories (M+) and storage memories (S1 — S9) is ten.

[RCL] Memory Recall Key

Displays the content of the independent memory or the storage memory specified by the number key. Press the [RCL] key, and one of the [0] — [9] keys you want.

[INV]X↔︎M Display-Memory-Exchange Key

Exchanges the content of the independent memory with the displayed value.

Example:

Display/Independent memory Exchange.

Note:

This key doesn’t exchange the displayed value with a content of any storage memory.

[INV]X↔︎S Display/Storage Memory Exchange Key

Exchange the displayed value with the content of the specified storage memory (S1 — S9).

Press the [INV]X↔︎S key, and one of the [0] — [9] keys.

Example:

[INV]X↔︎Y Register Exchange Key

Exchanges the content of the register X. Used to replace the contents, or to confirm the entered value. The [INV]X↔︎Y key also exchanges the entered value, when it is divided by the [(] key.

Example:

2 [+] 3 [×] 4 [INV]X↔︎Y (Exchanges 3 with 4).

Example:

Effective when you perform fractional calculations like 4/(2×3).

2 [×] 3 [÷] 4 [INV]X↔︎Y [=] (Exchanges the numerator with the denominator).

[INV]MDF Modification Key

Used to change the value in the calculation register to the displayed value. Calculations will then be performed on this new value.

Example:

Multiply the result of division, 5 ÷ 9, by 9:

[INV]TAB[1] specifies 1 for the number of decimal places.

- Ordinary calculation:

5 [÷] 9 [=] ➝ 0.6

[×] 9 [=] ➝ 5.0

- Calculation using the rounding feature:

5 [÷] 9 [=] [INV]MDF ➝ 0.6

[×] 9 [=] ➝ 5.4

[INT] Integer Display Key

Omits the decimal functional part of the value and displays only the integer portion.

[INV]FRAC Fraction Display Key

Omits the integer part of the value and displays only the fractional portion.

[INV]RND Random Number Key

Generates three-digit randomized values (effective up to 3 digits) hypothetically.

- Random numbers are used for random sampling in statistical calculation.
- The [INV]RND key can’t be used in the Binary, the Octal, and the Hexadecimal modes.
- Random numbers’ are displayed by 3 decimal digits in the floating readout. (0.000 — 0.999).
- Random numbers are not always displayed the same as the example below.

Example:

Perform random sampling from the three hundred students (ID 1 — 300)

One-Variable Function Keys

[sin] ⎫

[cos] ⎬ .......... Trigonometric Function Keys

[tan] ⎭

[ln] ............. Natural Logarithm Key

[log] ............ Common Logarithm Key

[1/x] ............ Reciprocal Key

[x2] .............. Square Key

[hyp] [sin] ⎫

[hyp] [cos] ⎬ ..... Hyperbolic Function Key

[hyp] [tan] ⎭

[INV]sin−1 ⎫

[INV]cos−1 ⎬ ....... Inverse Trigonometric Function Keys

[INV]tan−1 ⎭

[INV]ex ........... Exponential Function Key

[INV]10x .......... Common Index Key

[INV]∛ ............ Cubic Root Key

[INV]√ ............ Square Root Key

[INV]n! ........... Factorial Key

[hyp] [INV]sin−1 ⎫

[hyp] [INV]cos−1 ⎬ .. Inverse Hyperbolic Function Key

[hyp] [INV]tan−1 ⎭

[R→P] Rectangular to Polar Form Conversion Key

Used to convert rectangular form (x, y) to polar form (r, θ).

[INV]P→R Polar to Rectangular Form Conversion Key

Used to convert polar form (r, θ) to rectangular form (x, y).

Rectangular Form

Polar Form

[a], [b] Variable Entry keys

You can obtain the form performing the following operation

Rectangular → Polar Form Conversion

Polar → Rectangular Form Conversion

Example:

Convert the rectangular form (x = √3, y = 1) to the polar form. The angle is expressed in the DEG mode.

Example:

Convert the polar form (r = 2.13×103, θ = 35) to the rectangular form.

- You can start with either [a] or [b], when you enter the variables (a, b).
- When either of the 2 variables is 0, you don’t have to enter “0”. But when both are “0”, enter one of them.
- When you press either of 2 variables, parentheses, pending registers, and calculation orders are cleared.

In this diagram, (III and IV) is expressed as an angle in the clockwise direction

[nCr], [INV]nPr Combination and Permutation Key

Used to perform combination and permutation calculations.

Summation of permutation (formula)

nPr = n! / (n - r)!

Summation of combination (formula)

nCr = n! / r! / (n - r)!

The [a] and [b] keys are used to enter variables (n, r).

Example:

Calculate the permutation: 5P4

Example:

Calculate the combination: 8C6

- You can start with either [a] or [b], when you enter the variables (n, r).
- When either of the 2 variables is 0, you don’t have to enter “0”. But when both are “0”, enter one of them.
- When you press either of 2 variables, parentheses, pending registers, and calculation orders are cleared.

[A→B], [INV]A←B Metric Conversion Keys

Used to convert the unit of the value. Press this key and the specified conversion key.

The [A→B] key converts nonmetric values to metric values.

The [INV]A←B key converts metric values to nonmetric values.

OZ↔︎g, J↔︎cal, °F↔︎°C, in↔︎cm, gal↔︎l, lb↔︎kg, mmHg↔︎kPa, atm↔︎MPa Conversion Unit Keys

OZ↔︎g : Ounces ↔︎ Grams Key

J↔︎cal : Joules ↔︎ Calories Key

°F↔︎°C : Fahrenheit ↔︎ Centigrade Key

in↔︎cm : Inches ↔︎ Centimeters Key

gal↔︎l : U.S. Gallons ↔︎ Litres Key

lb↔︎kg : Pounds ↔︎ Kilograms Key

mmHg↔︎kPa : Hg Millimeters ↔︎ Kilo Pascal Key

atm↔︎MPa : Atmospheric Pressure ↔︎ Mega Pascal Key

Example:

What is 15 pounds in kg?

Example:

What is 7 kg in pounds?

Conversion Rates

The “gal” means U.S. Gallon

[0] — [9], {A} {B} {C} {D} {E} {F} Hexadecimal Entry Keys

The figures are the hexadecimal values (ABCDEF)

[0] — [7] Octal Entry Keys

The [8] and [9] keys will not operate in the Octal mode.

[0], [1] Binary Entry Keys

The keys [2] — [9] will non operate in the Binary mode.

Example:

Convert 246 (decimal) to Hexadecimal/Octal/Binary.

- The result of the calculation over the limit of the display is an overflow error. (ex. Converting 512 in decimal to binary displays “E”).
- Fractions are omitted from the result of Binary/Octal/Hexadecimal calculations.

Example:

Calculate 4 ÷ 3 in Octal.

{NEG} Complement Key

Complements are used for expressing negative numbers in the binary, Octal, and Hexadecimal modes.

Subtraction is carried out by adding the complement. Pressing of the [NEG] key converts values to complements, and pressing of it again converts the complements to the original values.

Example:

Display Readout

Table of Contents

Statistical Calculations

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