Calculator Fx 120S

Advanced scientific calculator with natural textbook display and 417 functions

Comprehensive Guide to the Casio fx-120ES Plus Scientific Calculator

The Casio fx-120ES Plus is an advanced scientific calculator designed for students and professionals who need to perform complex mathematical calculations. With its natural textbook display and 417 built-in functions, this calculator is particularly popular among high school and college students studying algebra, calculus, statistics, and engineering courses.

Key Features of the fx-120ES Plus

• Natural Textbook Display: Shows expressions and results exactly as they appear in textbooks, making it easier to verify your work.
• 417 Functions: Covers a wide range of mathematical operations including fractions, statistics, complex number calculations, base arithmetic, and more.
• Multi-replay Function: Allows you to backtrack through your calculations step-by-step to find and correct errors.
• Solar Powered with Battery Backup: Ensures the calculator is always ready when you need it.
• Two-line Display: Shows both the equation and the result simultaneously.
• Plastic Keys: Designed for easy operation and durability.
• Slide-on Hard Case: Protects the calculator when not in use.

Who Should Use the fx-120ES Plus?

This calculator is ideal for:

1. High School Students: Perfect for algebra, geometry, trigonometry, and pre-calculus courses.
2. College Students: Suitable for calculus, statistics, physics, and engineering classes.
3. Professionals: Useful for engineers, scientists, and anyone who needs to perform advanced mathematical calculations.
4. Standardized Test Takers: Approved for use on the SAT, ACT, PSAT/NMSQT, and AP exams.

Comparison with Other Casio Scientific Calculators

Model	Display	Functions	Natural Display	Solar Power	Best For
fx-120ES Plus	2-line	417	Yes	Yes	High school/college math
fx-300ES Plus	2-line	252	Yes	Yes	Basic high school math
fx-115ES Plus	2-line	280	Yes	Yes	High school math
fx-991EX	High-res	552	Yes	Yes	Advanced college/engineering

Advanced Functions and How to Use Them

1. Equation Solving

The fx-120ES Plus can solve equations with up to 4 unknowns. To solve an equation:

1. Press the [MODE] key and select “EQN” (Equation mode).
2. Select the type of equation (linear, quadratic, or cubic).
3. Enter the coefficients for each term.
4. Press [=] to solve.

2. Matrix Calculations

For matrix operations:

1. Press [MODE] and select “MAT” (Matrix mode).
2. Select the matrix dimensions (up to 4×4).
3. Enter the matrix elements.
4. Use the appropriate function keys for operations like determinant, inverse, or transpose.

3. Complex Number Calculations

To work with complex numbers:

1. Press [MODE] and select “CMPLX” (Complex number mode).
2. Enter complex numbers in the form a+bi.
3. Use standard operation keys for calculations.

4. Statistical Calculations

For statistical analysis:

1. Press [MODE] and select “STAT” (Statistics mode).
2. Enter your data points.
3. Use the appropriate keys to calculate mean, standard deviation, regression, and other statistical measures.

Tips for Getting the Most Out of Your fx-120ES Plus

• Use the Replay Function: If you make a mistake, use the replay function to go back and correct it without starting over.
• Learn the Shortcuts: Familiarize yourself with key combinations for common operations to save time.
• Practice with the Manual: The calculator comes with a comprehensive manual that explains all functions in detail.
• Keep it Protected: Always use the slide-on hard case when not in use to prevent damage.
• Check Your Mode: Many calculation errors occur because the calculator is in the wrong mode (e.g., degrees vs. radians).
• Use the Multi-line Playback: This feature lets you review and edit previous calculations, which is great for checking your work.

Common Mistakes to Avoid

1. Ignoring the Mode: Forgetting to set the correct angle mode (degrees, radians, or grads) can lead to incorrect trigonometric results.
2. Misplacing Parentheses: Incorrect placement of parentheses can completely change the result of a calculation.
3. Not Clearing Memory: Previous calculations stored in memory can affect new calculations if not cleared.
4. Overlooking the Shift Key: Many advanced functions require the shift key, which beginners often forget to use.
5. Not Using the Protective Case: The calculator can be damaged if dropped or exposed to moisture.

Maintenance and Care

To ensure your Casio fx-120ES Plus lasts for years:

• Clean Regularly: Use a soft, slightly damp cloth to clean the calculator. Avoid using harsh chemicals or abrasive materials.
• Avoid Extreme Temperatures: Don’t leave the calculator in direct sunlight or in very cold environments.
• Replace the Battery if Needed: While the calculator is solar-powered, the backup battery may need replacement after several years.
• Store Properly: When not in use, store the calculator in its protective case in a dry place.
• Handle with Care: Avoid dropping the calculator or subjecting it to strong impacts.

Educational Resources for Mastering Your Calculator

Recommended Learning Resources

The following authoritative resources can help you get the most out of your Casio fx-120ES Plus:

1. Casio Education Official Guide: The manufacturer’s official guide provides comprehensive instructions for all calculator functions. https://education.casio.com
2. National Council of Teachers of Mathematics (NCTM): Offers resources for using calculators effectively in mathematics education. https://www.nctm.org
3. Khan Academy Calculator Lessons: Free online lessons that include calculator usage for various math topics. https://www.khanacademy.org

Frequently Asked Questions

1. Is the Casio fx-120ES Plus allowed on the SAT?

Yes, the Casio fx-120ES Plus is approved for use on the SAT, ACT, PSAT/NMSQT, and AP exams. However, always check the latest guidelines from the College Board as policies can change.

2. How do I reset my calculator to factory settings?

To reset your calculator:

1. Press [SHIFT] + [9] (CLR) + [3] (All) + [=]
2. Press [AC] to confirm

This will clear all memory and restore factory settings.

3. Can I use this calculator for calculus?

Yes, the fx-120ES Plus has functions for calculus including differentiation and integration, though for more advanced calculus work, you might consider the fx-991EX which has additional features.

4. How do I calculate standard deviation?

To calculate standard deviation:

1. Press [MODE] and select “STAT” (Statistics mode)
2. Enter your data points
3. Press [SHIFT] + [1] (STAT) + [3] (σxn-1) for sample standard deviation or [4] (σxn) for population standard deviation

5. What’s the difference between the fx-120ES and fx-120ES Plus?

The “Plus” version typically includes some additional functions and improvements over the original model. The fx-120ES Plus has:

• More functions (417 vs 401 in the original)
• Improved display contrast
• Better battery life
• Some additional statistical functions

Performance Comparison: fx-120ES Plus vs Other Scientific Calculators

Feature	Casio fx-120ES Plus	Texas Instruments TI-30XS	Sharp EL-W516T	Casio fx-991EX
Display Type	Natural Textbook	Multi-line	WriteView	High-resolution
Number of Functions	417	232	640	552
Equation Solving	Up to 4 unknowns	Up to 3 unknowns	Up to 4 unknowns	Up to 4 unknowns
Matrix Operations	Up to 4×4	Up to 3×3	Up to 4×4	Up to 4×4
Complex Numbers	Yes	Yes	Yes	Yes
Statistical Functions	Advanced	Basic	Advanced	Very Advanced
Price Range	$$$	$	$$$$
Best For	High school/college	Basic high school	College/engineering	Advanced engineering

Final Verdict: Is the Casio fx-120ES Plus Worth It?

The Casio fx-120ES Plus is an excellent choice for students and professionals who need a reliable, feature-rich scientific calculator. Its natural textbook display makes it easier to verify calculations, and its wide range of functions covers most mathematical needs through college-level courses.

Pros:

• Natural textbook display is very intuitive
• Comprehensive function set (417 functions)
• Durable construction with protective case
• Approved for most standardized tests
• Good balance between advanced features and ease of use

Cons:

• More expensive than basic scientific calculators
• Some advanced users might need even more functions (consider fx-991EX)
• Plastic keys might feel less premium than some competitors

Final Recommendation: If you’re a high school or college student looking for a calculator that will last through several years of math and science courses, the Casio fx-120ES Plus is an excellent investment. It offers the right balance of advanced features and usability at a reasonable price point.