Texas Instruments TI-30XA

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Calculator Instructions for TI – 30XA

ON / C Press this key to turn the calculator on or to clear the display

2nd This key is like a shift key and allows you to use the functions above each key in the

pad

Percent: To find 22% of 110, you can either change 22% to a decimal and then

multiply. Or you can use the percent key (located above the digit “2”) as

follows: 110 X 22 2nd 2 = (Answer = 24.2)

Fractions: To do calculations with fractions, use the a

function.

For example, to calculate 2/3 + 1 4/7 , enter the following keystrokes:

2 a

3 + 1 a

4 a

7 = (Answer = 2 5/21)

To change a fraction to a decimal, or a decimal to a fraction, use the

↔

D function which is located above the

←

key.

For example, to change 4/5 to a decimal, enter:

4 a

5 2nd

←

(Answer = 0.8)

To change a 0.625 to a fraction, enter:

0.625 2nd

←

(Answer = 5/8)

Powers: To square a number use

To raise a number to a power other than 2, use the

function.

For example, to find

, enter 5

3 = (Answer = 125)

Roots: To find the square root of a number, use

Angles: To change an angle in degrees, minutes and seconds to decimal

degrees, use the DMS

→

DD function. For example to change 45



37’ 5”

to decimal degrees, enter: 45.3705 2nd + (Answer = 45.618



)

To change an angle in decimal degrees to degrees, minutes and seconds, use the

→

DMS function. For example, to change 30.45



to degrees, minutes, and

seconds, enter: 30.45 2nd = (Answer = 30



27’)

Trig: To find the trig function of any angle, enter the angle first and then press

the appropriate trig function.

For example to find sin 53



, enter 53 sin (Answer = 0.799)

To find the inverse trig function, enter the ratio first and then press the

inverse trig function. For example, to find sin

1−

(0.45), enter

0.45 2nd sin (Answer = 26.74



)

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Summary

Calculator Instructions for TI - 30ХА

Percent Function

Find a percentage of a number using the percent key.

Fraction Calculations

Perform calculations with fractions and convert between fractions and decimals.

Powers and Roots

Calculate squares, other powers, and square roots of numbers.

Angle Conversions

Convert angles between degrees, minutes, seconds and decimal degrees.

Trigonometric Functions

Find trigonometric and inverse trigonometric functions of angles.

Important Information Regarding Calculators

Calculator Model and Capabilities

Details the Texas Instruments TI-30XA model supplied for examinations.

Exam Restrictions

Prohibits personal calculators, cell phones, PDAs, and other electronic devices.

The Texas Instruments TI-30XA is a scientific calculator designed for a wide range of mathematical operations, suitable for various trades and educational purposes. Its user-friendly interface and comprehensive set of functions make it a reliable tool for both basic arithmetic and more complex scientific calculations.

Function Description:

The TI-30XA offers a robust set of functions, categorized for ease of use. At its core, it handles standard arithmetic operations: addition, subtraction, multiplication, and division. These are accessed via dedicated keys on the keypad.

Percent Calculations: The calculator includes a dedicated percent function, located above the '2' key and accessed via the '2nd' key. This allows users to easily calculate percentages of a number without converting the percentage to a decimal first. For example, to find 22% of 110, one would input "110 X 22 2nd 2 =". This streamlines calculations involving discounts, taxes, or interest.

Fraction Operations: A key feature for many trades is the ability to work directly with fractions. The TI-30XA incorporates an "a b/c" key, which enables users to input and perform calculations with fractions and mixed numbers. For instance, to calculate 2/3 + 1 4/7, the input sequence would be "2 a b/c 3 + 1 a b/c 4 a b/c 7 =". The calculator will display the result as a mixed number or an improper fraction.

Fraction-Decimal Conversions: The calculator also facilitates seamless conversion between fractions and decimals. The "F↔D" function, located above the percent key and accessed with the '2nd' key, allows users to toggle between these representations. To convert 4/5 to a decimal, one would enter "4 a b/c 5 2nd F↔D". Conversely, to convert a decimal like 0.625 to a fraction, the input would be "0.625 2nd F↔D". This flexibility is invaluable for tasks requiring both precise fractional values and decimal approximations.

Power and Root Functions: For scientific and engineering applications, the TI-30XA provides functions for powers and roots. The "x²" key allows for squaring a number directly. For higher powers, the "yˣ" function is available. To calculate 5 raised to the power of 3 (5³), the sequence is "5 yˣ 3 =". The calculator also includes a square root function, "√x", for finding the square root of a number.

Trigonometric Functions: The calculator supports standard trigonometric functions: sine (sin), cosine (cos), and tangent (tan). To find the sine of 53 degrees, the user would input "53 sin". Inverse trigonometric functions (sin⁻¹, cos⁻¹, tan⁻¹) are also available, accessed via the '2nd' key. To find the angle whose sine is 0.45, the input would be "0.45 2nd sin". These functions are essential for geometry, physics, and various engineering calculations.

Angle Conversions (DMS↔DD): A practical feature for surveying, navigation, and other fields is the ability to convert between degrees, minutes, and seconds (DMS) and decimal degrees (DD). The "DMS→DD" function, accessed with the '2nd' key, converts DMS to DD. For example, to convert 45° 37' 5" to decimal degrees, the input is "45.3705 2nd +". The "DD→DMS" function performs the reverse conversion. To convert 30.45° to degrees, minutes, and seconds, the input is "30.45 2nd =". This simplifies working with angular measurements.

Memory Functions: The calculator includes memory functions (STO, RCL) to store and recall numbers, which is useful for multi-step calculations or for storing constants.

Usage Features:

ON/C Key: The "ON/C" key serves a dual purpose: it turns the calculator on and clears the display, ensuring a fresh start for new calculations.

2nd Key: The "2nd" key acts as a shift key, similar to a computer keyboard's Shift key. It activates the secondary functions printed above many of the primary keys. These secondary functions are typically in a different color or font to distinguish them. This design allows for a compact keypad while offering a wide range of functionalities.

Display: The calculator features a clear, single-line display that shows the input and results. The display is designed for readability, making it easy to track calculations.

Keypad Layout: The keypad is logically organized, with numeric keys in a standard layout and function keys grouped by type. This intuitive arrangement helps users quickly locate the desired functions.

Power Source: The TI-30XA is typically powered by a battery, ensuring portability and long-lasting use.

Durability: The calculator is designed for everyday use in various environments, including educational settings and professional trades. Its robust construction helps it withstand typical wear and tear.

Maintenance Features:

Battery Replacement: While not explicitly detailed in the provided text, scientific calculators like the TI-30XA generally allow for user-replaceable batteries. This is a common maintenance feature that extends the lifespan of the device. Instructions for battery replacement are usually found in the full user manual.

Cleaning: The calculator's surface can be cleaned with a soft, dry cloth to remove dust and smudges. Care should be taken to avoid liquids that could damage the internal components.

Storage: When not in use, storing the calculator in a protective case or a safe place can prevent scratches or damage to the screen and keys.

No User Serviceable Parts (Internal): Like most electronic devices, the internal components of the TI-30XA are not designed for user servicing. Any internal issues would typically require professional repair or replacement of the unit.

The TI-30XA is a reliable and versatile tool, designed to meet the computational needs of students and professionals across various disciplines, with a focus on ease of use and a comprehensive set of mathematical functions.

Texas Instruments TI-30XA Specifications

General

Digits	10 digits
Display tilting	No
Display number of lines	1 lines
Type	Scientific
Cover	-
Form factor	Pocket
Control type	Buttons
Product color	Gray
Housing material	Plastic
Power source	Battery