Blog
Guides and worked examples for getting more out of the calculator.
August 29, 2026
Best Free Online Graphing Calculators (and When You Actually Need a TI-84)
Desmos, GeoGebra, and a TI-84 Plus CE-style calculator compared honestly — what each is actually built for, and how to tell which one your class, homework, or exam actually needs.
August 29, 2026
TI-84 Emulator: What It Actually Takes to Run One (and a No-ROM Alternative)
What a real TI-84 emulator requires, why you can't just download a ROM, the legitimate options (CEmu, Wabbitemu, jsTIfied), and why this site's calculator skips the ROM step entirely.
August 10, 2026
How to Use a TI-84: The Basics
A beginner's walkthrough of the TI-84 Plus and TI-84 Plus CE home screen — entering expressions, reusing Ans and entry history, storing variables, and setting your mode.
August 10, 2026
TI-84 for AP Statistics: Where Every STAT Function Lives
Test statistics, confidence intervals, chi-square, variance, critical values, and more — which TI-84 menu each one actually comes from, and the few values it won't hand you directly.
August 10, 2026
TI-84 Calculator Reference Sheet: Buttons & Symbols
Where π, e, the percent operator, the equal sign, and other hard-to-find TI-84 functions actually live — grouped by what they do, not where they sit on the keypad.
August 10, 2026
How to Charge a TI-84 Plus CE (and Fix It When It Won't)
Charging, battery life, and power for the TI-84 Plus CE's rechargeable battery and the older AAA-powered TI-84 Plus — plus what to do when it won't charge or won't turn on.
August 10, 2026
Derivatives, Integrals, and Limits on a TI-84
nDeriv( and fnInt( for numerical calculus on the home screen, the dy/dx and ∫f(x)dx graph tools, and why there's no limit( function at all.
August 10, 2026
The DRAW Menu on a TI-84: Line, Circle, Tangent, and Shade
What each DRAW menu tool actually does on a TI-84 — freehand lines and circles, a tangent line at a point, shading between two curves, and how to clear it all afterward.
August 10, 2026
Is There a Notes App on the TI-84? How to Save Formulas Instead
The TI-84 has no built-in Notes app — the real workaround is the PRGM editor, used to hold text instead of a runnable program, and it's the same trick used for saving formulas.
August 10, 2026
How to Calculate NPV and IRR on a TI-84
The TI-84's Finance app has dedicated npv( and irr( functions for uneven cash flows — separate from the TVM Solver — with the exact syntax and a worked example for each.
August 10, 2026
Where to Find the Serial Number on a TI-84
The serial number is a physical engraving on the back case, not something the screen displays — plus where the separate on-screen Product ID lives if that's what you actually need.
August 10, 2026
Is a TI-84 a CAS, Scientific, Programmable, or Financial Calculator?
The TI-84 Plus CE gets called all four — here's which labels actually apply, which don't, and why the CAS question in particular matters for exam rules.
July 31, 2026
How to Download, Install, and Put Games on a TI-84 Plus CE
The real process for getting games onto a physical TI-84 Plus CE (or the older TI-84 Plus) — TI Connect CE, where to find legitimate program files, and how to actually launch one afterward.
July 31, 2026
TI-83 vs TI-84: What's the Difference?
How the TI-83 Plus and TI-84 Plus actually differ — speed, memory, USB, and MathPrint — and why the math they can do is nearly identical.
July 30, 2026
How to Do Factorial on a TI-84
Where the factorial operator lives on a TI-84 Plus, the syntax for typing it directly, and the domain and overflow limits worth knowing before you rely on it.
July 30, 2026
Is a TI-84 Allowed on the ACT or SAT? Calculator Rules Explained
Which calculators the ACT and SAT actually permit, where the TI-84 Plus CE and TI-30XS fall, which TI models are banned, and what changes on the digital versions of each test.
July 27, 2026
How to Use a TI-30XS Calculator: The Basics
A beginner's walkthrough of the TI-30XS Multiview — entering expressions, the fraction/decimal toggle, trig and log functions, and memory.
July 27, 2026
TI-30XS Calculator Reference Sheet: Keys & Functions
A quick reference for the TI-30XS Multiview's keys and functions — fractions, trig, logs, powers, percent, and memory.
July 26, 2026
TI-84 vs TI-84 Plus vs TI-84 Plus CE: What's the Difference?
How the TI-84 Plus and TI-84 Plus CE actually differ — plus release dates for every model in the line, and why the function set has stayed the same across all of them.
July 25, 2026
TI-30XS vs TI-84 Plus CE: Which Calculator Do You Need?
TI-30XS Multiview or TI-84 Plus CE? A feature-by-feature comparison covering exam rules, graphing, and which one actually fits your class.
July 5, 2026
How to Make a Residual Plot on a TI-84
What a residual plot is actually checking for, and the workflow for building one on a TI-84 from a linear regression's predicted values.
July 4, 2026
How to Find a P-Value on a TI-84
How p-values are generated on a TI-84 through the STAT TESTS menu, what they mean, and a worked example with a 1-sample Z-test.
July 3, 2026
How to Delete a Program on a TI-84 Plus or TI-84 Plus CE
How to delete one program on a TI-84 Plus or TI-84 Plus CE without wiping everything else, whether you can undo a delete, and the memory-management view for clearing several at once.
July 2, 2026
How to Find the Correlation Coefficient on a TI-84
How to get the correlation coefficient (r) from paired data on a TI-84 using linear regression, and how to read its sign and size.
July 1, 2026
How to Find a Z-Score on a TI-84 Plus or TI-84 Plus CE
The z-score formula, how to compute it on a TI-84 Plus or TI-84 Plus CE by hand from 1-Var Stats output, and how it connects to the calculator's normalcdf and invNorm tools.
June 30, 2026
How to Find Standard Deviation on a TI-84 Plus or TI-84 Plus CE
How to calculate standard deviation on a TI-84 Plus or TI-84 Plus CE using 1-Var Stats, and why the calculator gives you two different standard deviations at once.
June 29, 2026
How to Do a Cube Root on a TI-84
The dedicated cube root shortcut on a TI-84 Plus, how it differs from the general nth-root menu, and how to type it directly as an expression.
June 28, 2026
How to Graph on a TI-84 Plus or TI-84 Plus CE: A Beginner's Walkthrough
The full workflow for graphing a function on a TI-84 Plus or TI-84 Plus CE — entering the equation, setting the window, and using Zoom and Trace to actually read the graph.
June 27, 2026
How to Do Absolute Value on a TI-84 Plus or TI-84 Plus CE
How to type absolute value on a TI-84 Plus or TI-84 Plus CE using abs(, what it actually returns, and a worked example with a negative expression inside.
June 26, 2026
How to Do Fractions on a TI-84 Plus (▸Frac and the Fraction/Decimal Toggle)
How to make a TI-84 show an answer as a fraction instead of a decimal, using the ▸Frac conversion — including why some decimals won't convert cleanly.
June 25, 2026
How to Reset (or Restart) a TI-84 — What Each Option Actually Clears
The three reset levels on a TI-84 Plus — RAM, Defaults, and Archive — what each one wipes, how a plain screen clear differs from all three, and which one actually fixes a frozen or misbehaving calculator.
June 20, 2026
How to Solve Quadratic Equations on a TI-84 Plus CE (Step by Step)
How to solve quadratic equations by hand and on a TI-84 Plus CE — what the discriminant means, why some roots come out as complex numbers, and how to graph the parabola instead.
June 2, 2026
How to Graph a Circle Using Parametric Equations
A circle isn't a function of x — here's how parametric mode lets you graph one anyway, plus why it's the right tool for any curve that doubles back on itself.
May 12, 2026
Degrees vs. Radians: When to Use Each Angle Mode
A practical guide to choosing between degree, radian, and gradian mode on a graphing calculator — and why the wrong mode gives you a wrong-looking answer, not an error.