Using TI-84 Calculator in SAT & ACT Exams
If you’re preparing for the SAT or ACT, you’ve probably heard that the TI 84 calculator is one of the best tools allowed on test day. But how can you make the most of it?
In this guide, you’ll learn:
- Which TI 84 models are permitted
- Key calculator features allowed on the exams
- Time-saving tricks and functions
- What not to do to avoid disqualification
Let’s unlock the full potential of your TI 84 calculator for SAT and ACT prep.
Are TI 84 Calculators Allowed on SAT and ACT?
Yes! The TI 84 Plus, TI 84 Plus CE, and older versions are all approved calculators for both tests.
✅ Allowed Models:
- TI-84 Plus
- TI-84 Plus CE
- TI-84 Plus Silver Edition
- TI-84 Plus C Silver Edition
❌ Not Allowed:
- TI-89
- TI-Nspire CAS models (with Computer Algebra System)
Always check the official SAT calculator policy and ACT calculator policy before test day.
Why the TI 84 is Perfect for SAT and ACT
The TI 84 strikes a perfect balance between power and simplicity. It’s fast, non-CAS (legal), and includes functions that help with:
- Solving equations
- Graphing and analyzing functions
- Performing statistical calculations
- Working with fractions and roots
- Handling large numbers and decimals accurately
Must-Know TI 84 Tricks for the SAT and ACT
1. Solving Quadratic Equations Automatically
Use the polynomial root finder app (under Apps > PlySmlt2) to solve quadratics quickly. Enter coefficients, and it gives you roots instantly—no need to memorize the quadratic formula under pressure.
2. Graphing Functions to Check Algebra Answers
Graph both sides of an equation (e.g., Y1 = left side, Y2 = right side) and use the 2nd > TRACE > Intersect function to find where they match.
Perfect for questions with “What value of x satisfies…” or inequality problems.
3. Working with Fractions
You can input and simplify fractions like this:
ALPHA→Y=(for fraction template)- Enter numerator and denominator
- Press
ENTER
This helps avoid mistakes with decimals or mixed numbers.
4. Statistical Analysis for ACT
On the ACT math section, statistics questions often ask for:
- Mean, median, mode
- Standard deviation
- Regression line (y = ax + b)
Use STAT > Edit to enter data and STAT > Calc for 1-Var Stats or Lin Reg.
5. Using the Table Feature for Word Problems
Use Y= to enter an equation and 2nd > TABLE to quickly generate values. This is ideal for rate or cost problems where plugging in values saves time.
6. Solving Systems of Equations
Use the simultaneous equation solver (Apps > PlySmlt2) for problems like:
2x + 3y = 10
4x - y = 5
Just enter the coefficients, and the calculator gives you the solution directly.
Test-Day Calculator Tips
✅ DO:
- Bring fresh batteries
- Reset memory before the test if required by proctor
- Practice using the calculator before test day
- Familiarize yourself with key apps like PolySmlt2 and statistics tools
❌ DON’T:
- Try to install programs or store formulas (prohibited and may lead to disqualification)
- Rely on the calculator for every question—some are faster solved by hand
- Forget to set Degree mode for geometry questions
SAT vs ACT: Calculator Use Differences
| Feature | SAT | ACT |
|---|---|---|
| Calculator Section Only | Yes | No (Calculator allowed throughout) |
| Tricky Calculator Questions | Often | Occasionally |
| Trig Functions | Some | Common |
| Heavy on Graphing? | Yes | Not as much |
Tip: On the ACT, calculator speed matters more because you can use it the entire time. On the SAT, focus on strategic use.
Conclusion
The TI 84 calculator is a major asset for both the SAT and ACT when used smartly. It helps with algebra, graphing, statistics, and time management—exactly what you need to boost your score.
Master the built-in features, avoid risky behavior like storing notes, and practice often so the calculator becomes second nature on test day.
