TI-84 Calculator: Complete Guide to Using the TI-84 Plus & CE

Press:8×7ENTER

Enter arithmetic expressions directly onto the home calculation screen. The TI-84 follows strict PEMDAS algebraic operator precedence (Parentheses, Exponents, Multiplication & Division left-to-right, Addition & Subtraction). Expressions like 5 + 3 * 2 correctly evaluate to 11, while (5 + 3) * 2 evaluates to 16.

Tip: To reuse your previous result in a new calculation, press [2nd] + [(-)] to insert the 'Ans' variable.

Press:ALPHAY= (F1)1: n/d

On TI-84 Plus CE and MathPrint models, press [ALPHA] then [Y=] to open the fraction shortcut palette. Option '1: n/d' inserts a clean vertical fraction template. Type the numerator, press Down Arrow to enter the denominator and press Right Arrow to step out. To convert any decimal into an exact fraction, press [MATH] → 1: ▶Frac → [ENTER].

Tip: On older monochrome TI-84 models without MathPrint, enter fractions with the division key inside parentheses: (1/2) + (1/3).

Press:2^5ENTER

Use the carat [^] key for arbitrary powers (such as 2^5 = 32) and the dedicated [x²] key for squaring. To take a square root, press [2nd] + [x²] (√). Critical TI-84 rule: typing -5² yields -25 because exponentiation takes precedence over unary negation (-(5²) = -25). To square negative five, you must use parentheses: (-5)² = 25.

Tip: For cube roots or nth roots, press [MATH] and select option '4: ³√(' or '5: ˣ√'.

Press:MODESelect DEGREE or RADIANENTER

Before computing trigonometric ratios, verify the calculator's angle mode. Press [MODE] and select 'DEGREE' for geometry, physics and basic trigonometry (sin(30°) = 0.5), or 'RADIAN' for calculus (sin(π/6) = 0.5). Use [SIN], [COS] and [TAN] for primary functions and press [2nd] first to access inverse functions (sin⁻¹, cos⁻¹, tan⁻¹).

Tip: Press [2nd] + [MODE] (QUIT) at any time to escape menus and return to the main calculation screen.

Press:LOGorLN

Press the [LOG] button for common base-10 logarithms (log(100) = 2). Press [LN] for natural logarithms base-e (ln(e) = 1). For Euler's constant 'e', press [2nd] + [LN] (eˣ) or [2nd] + [÷] (e). On TI-84 Plus CE models, you can also press [MATH] and select 'logBASE(' to compute logarithms with custom bases.

Tip: Taking the logarithm of zero or a negative number returns 'ERR: DOMAIN'.

Press:Y=X,T,θ,nx²-4

Press the top-left [Y=] key to open the function list. Use the [X,T,θ,n] variable key to enter 'X'. Type your equation in Y1 (such as X^2 - 4) and press [GRAPH] to plot the curve. The TI-84 Plus CE supports up to 10 simultaneous equations with dedicated color lines and styles.

Tip: To temporarily hide an equation without deleting it, scroll onto its '=' sign and press ENTER to un-highlight it.

Press:ZOOM6: ZStandard

If your curve is off-screen or distorted, press [ZOOM] and choose '6: ZStandard' to reset the coordinate grid to [-10, 10] on both axes. To customize your view, press [WINDOW] and manually configure Xmin, Xmax, Xscl, Ymin, Ymax and Yscl.

Tip: If you receive 'ERR: WINDOW RANGE', check that Xmin is strictly less than Xmax and Ymin is less than Ymax.

Press:2ndTRACE (CALC)

Press [2nd] + [TRACE] to open the Calculate menu. Select '2: zero' to find x-intercepts, '3: minimum' or '4: maximum' for peaks and valleys and '5: intersect' to find where two curves cross. Use the arrow keys to specify a Left Bound, a Right Bound and an initial Guess when prompted.

Tip: When finding intersections, place your cursor close to the target intersection point before pressing ENTER on Guess.

Press:STAT1: Edit...

Press [STAT] and choose '1: Edit...' to access the spreadsheet data editor. Enter your values into column L1, pressing ENTER after each entry. To clear an old list, scroll up to highlight the header 'L1', press [CLEAR] and press [ENTER].

Tip: CRITICAL: Never press [DEL] on a list header (like L1), as that deletes the column from the screen! If accidentally deleted, restore all columns via STAT → 5: SetUpEditor.

Press:STAT▶ (CALC)1: 1-Var Stats

Press [STAT], arrow right to the 'CALC' menu and select '1: 1-Var Stats'. Verify that List is set to L1 (leave FreqList blank for unweighted data), scroll to 'Calculate' and press ENTER. Read 'x̄' for sample mean, 'Sx' for sample standard deviation, 'σx' for population standard deviation and scroll down for the 5-number summary (MinX, Q1, Med, Q3, MaxX).

Tip: Most high school and college statistics assignments require sample standard deviation (Sx), not population (σx).

Press:STAT▶ (CALC)4: LinReg(ax+b)

Input your independent X-values into list L1 and dependent Y-values into list L2. Press [STAT], arrow to 'CALC' and select '4: LinReg(ax+b)'. Select Calculate to generate the slope (a) and y-intercept (b). To display the correlation coefficient (r) and coefficient of determination (r²), turn on diagnostics: on OS 5.x press [MODE] and set STAT DIAGNOSTICS to ON, or on any model press [2nd] + [0] (CATALOG), scroll to DiagnosticOn and press [ENTER].

Tip: DiagnosticOn only needs to be enabled once; it remains active until memory is reset.

Press:2ndVARS (DISTR)

Press [2nd] + [VARS] to access the Distribution menu. Select '2: normalcdf(' to calculate the cumulative area under a normal curve between lower and upper boundaries: normalcdf(lower, upper, μ, σ). Select '3: invNorm(' to find the cutoff value for a given percentile area. The menu also contains Student-t, Chi-Square and Binomial distributions (binompdf / binomcdf).

Tip: For standard normal distributions, leave μ = 0 and σ = 1.

Press:2ndx⁻¹ (MATRIX)

Press [2nd] + [x⁻¹] (MATRIX) and arrow over to 'EDIT' to define your matrix dimensions (e.g. 2×2) and fill in the values. Return to the home screen, select matrix [A] from the NAMES menu and perform operations: add [A]+[B], multiply [A]*[B], invert [A]⁻¹ using the [x⁻¹] key, or find reduced row echelon form via MATRIX → MATH → 'B: rref(' for systems of linear equations. Matrices work in this simulator too: type one on the home screen as [[1,2][3,4]]→[A], then use [A]⁻¹, [A]*[B], det([A]) or rref([A]). The EDIT grid for filling a matrix cell by cell is not simulated yet.

Tip: Matrix multiplication requires the number of columns in [A] to match the number of rows in [B].

Press:MATH▲B: Solver...

Press [MATH] and scroll up to select 'B: Solver...' (or Numeric Solver on CE models). Enter the left side of the equation in E1 and the right side in E2 (or 0 = Expression on older models). Enter an initial guess for the variable and press [ALPHA] + [ENTER] (SOLVE) to calculate the numerical root. The solver is not simulated on this site; here, graph the equation and use [2nd] + [TRACE] → 2: zero instead.

Tip: The solver finds one root at a time. If multiple roots exist (like a quadratic), change your initial guess to locate other solutions.