On this page
How to use it
- Press the keys with the mouse or a finger. Small green labels above a key are its 2nd functions: press 2nd first, then the key.
- Multi-tap keys cycle on repeated presses: sin gives sin, sin⁻¹, sinh, sinh⁻¹, and the variable key gives x, y, z, t, a, b, c, d. Press ▶ to accept a choice before pressing the same key again.
- In MathPrint mode, n/d opens a stacked fraction (▼ moves to the denominator), x□ opens an exponent box (▶ leaves it), and 2nd [√] opens a square root.
- Press enter. The entry and the answer go into the history; ▲ walks back through earlier entries and answers, and enter pastes the one you highlight.
- The side panel shows the full-precision answer, the keys you pressed, and buttons to copy the answer or a replay link.
You can also type: digits, + - * / ^ ( ), Enter, Backspace, Esc for clear, and the arrow keys. The switch above the panel changes the keypad to the TI-30XS MultiView order, the on-screen calculator of the GED test.
| Link parameter | Example | What it does |
|---|---|---|
keys | ?keys=2nd,sq,8,enter | Replays these keys from a fresh calculator, so a teacher can send the exact problem |
model | ?model=30xs | Opens the TI-30XS MultiView style keypad |
Which keys solve which FE problems
The NCEES list for 2026 allows every TI-36X and TI-30X model in the FE and PE exams. Four of the TI-36X Pro's 2nd keys do work that takes minutes by hand.
| FE problem | Keys |
|---|---|
| Roots of a quadratic or cubic (vibration, beam deflection, kinematics) | 2nd [poly-solv], above cos |
| Two or three simultaneous equations (mesh currents, truss joints, mixing) | 2nd [sys-solv], above tan |
| One equation with no tidy algebra (interest rate, friction factor) | 2nd [num-solv], above sin |
| Slope at a point, area under a curve | 2nd [d/dx] above ln log, 2nd [∫□dx] above e□ |
| Phasors and impedance in AC circuits | 2nd [complex] above π, with the ∠ symbol |
| Physical constants and unit changes | 2nd [constants] above (, 2nd [convert] above 8 |
Worked key sequences
Quadratic: 2x² − 3x − 5 = 0
Press 2nd [poly-solv], enter to choose ax²+bx+c=0, then type a = 2 ▼ b = (−)3 ▼ c = (−)5 and enter. The solver shows x1 = 5/2 and x2 = −1, which you can confirm by factoring: (2x − 5)(x + 1) = 0. It also gives the vertex form with h = 3/4 and k = −49/8. Press ◂▸ to see 2.5 instead of 5/2.
Mesh currents: a 3×3 system
Three loop equations from a resistor network: 6I₁ − 2I₂ = 10, −2I₁ + 8I₂ − 3I₃ = 0 and −3I₂ + 7I₃ = −5. Use x, y, z for the three currents. Press 2nd [sys-solv], ▼ to 3×3 LIN SYSTEM, enter, then type the 12 coefficients row by row, pressing enter after each: 6, (−)2, 0, 10, then (−)2, 8, (−)3, 0, then 0, (−)3, 7, (−)5. The final enter solves it: x = 220/127, y = 25/127, z = −80/127. With ◂▸ these are 1.732283465 A, 0.1968503937 A and −0.6299212598 A. The answers are also stored in x, y and z for the next step.
Interest rate with the numeric solver
An engineering economics question: which annual rate makes six end-of-year payments of $200 worth $1,000 today? The equation is 1000 = 200(1 − (1 + i)⁻⁶) ÷ i, with i as x. Press 2nd [num-solv], type 1000, press ▶ to reach the right side, type 200(1−(1+x)^(−6)) ÷ x and press enter. Give a starting guess of x = 0.1, press ▼ to SOLVE and enter. The answer is x = 0.05471792502, about 5.47 percent. Start near a sensible answer; a guess of 0 divides by zero.
Integral and derivative
Set RAD first (mode, ▶, enter, clear). Press 2nd [∫□dx], type the lower limit 0, ▶, the upper limit π, ▶, then x sin(x). The result is π, the value of ∫₀^π x sin x dx found by integration by parts. For a slope, 2nd [d/dx] with 4.9x² and x = 3 gives 29.4, the speed in m/s after 3 s of free fall from s = 4.9t².
Phasor current: 120 V across 3 + 4i Ω
Set the complex format to r∠θ in the mode screen (fourth row), then type 120 ÷ (3+4i), using the π e i key three times for i. In DEG mode the current is 24∠−53.13010235: 24 A lagging the voltage by 53.13°.
Constants and conversions
The pressure of 2 mol of an ideal gas at 300 K in 0.05 m³ is P = nRT/V. Type 2 × 2nd [constants], pick R (item 5), × 300 ÷ 0.05, enter: 99773.55142 Pa. Then 2nd [convert], 4 for pressure, 2 for Pa▸atm, enter: 0.984688393 atm.
How answers are shown: fractions, roots, π and decimals
MathPrint answers stay exact where the handheld keeps them exact. √8 shows 2√2, π × 12² shows 144π, 5cos(π/4) in RAD shows 5√2/2, and 3/4 + 1 7/12 shows 7/3. The ◂▸ key switches the last answer between the exact form and a decimal, and back. 2nd [f◂▸d] does the same for fractions inside an entry, and math 1 turns 7/3 into the mixed number 2 1/3.
The ÷ key and the n/d key are not the same. 1 ÷ 3 shows 0.333333333, while n/d 1 ▼ 3 shows 1/3. Typing any decimal point also gives a decimal answer: (1.2 + 1.3)/4 is 0.625, not 5/8. FLOAT shows up to 10 digits; FIX 0 to 9 rounds the display only, and SCI and ENG show powers of ten (ENG uses multiples of 3, as in 29.4E6). Classic mode shows everything on one line, keeps fractions such as 7/3, and gives decimals for roots and π.
Mode settings that cause wrong answers
- Degrees and radians. sin(30) is 1/2 in DEG but −0.988031624 in RAD. Calculus problems with trig need RAD: the same ∫₀^π x sin x dx in DEG gives 0.180332979, because the calculator reads sin(x) as x degrees.
- Negation key. (−) is not the minus key. (−)3² is −9 because the square is applied first; type ( (−)3 ) x² for 9.
- Classic power order. 2^3^2 is 512 in MathPrint (right to left) but 64 in Classic (left to right).
- Implied multiplication. 6 ÷ 2(1+2) is 9: implied multiplication has the same rank as ÷, so the calculator works left to right.
- The d/dx step. The derivative is a symmetric difference with a step of 0.001, so d/dx sin(x) at 0 shows 0.999999833, not 1.
- FIX left on. FIX 2 from an earlier problem turns 0.00049 into 0.00. Check the FIX flag at the top of the display.
What this version leaves out
The handheld's matrix and vector menus (2nd [matrix], 2nd [vector]) are not built yet; the matrix calculator covers determinants, inverses and RREF. Data editor formulas and the LIST and ALL options of the binomial menus are also missing.
Embed the TI-36X Pro Style Calculator on your website
Teachers, bloggers and course sites can add this tool to any web page for free. Paste the code below into an HTML or embed block (WordPress, Google Sites, Canvas, Moodle, Blogger, Wix). It loads the same tool you see above, without our menus or ads. Please keep the credit line under the frame. Sizes, a live preview and step-by-step guides for each platform are on the calculator widget page.
Frequently asked questions
Can I use this calculator in the FE exam?
No. The FE and PE exams allow only approved handheld models, and the TI-36X Pro is one of them. This page is for practising the key sequences before exam day.
Is WideMath made by Texas Instruments?
No. WideMath is an independent project and is not affiliated with Texas Instruments. The calculator is our own code that follows the key order and behaviour described in the public guidebooks; it is not an emulator and uses no TI software.
Why does 1 ÷ 3 show a decimal but n/d gives 1/3?
On a MathPrint calculator the ÷ key gives a decimal unless the answer is a whole number, while the n/d key builds a fraction that stays exact. Press the ◂▸ key after any answer to switch between the decimal and the fraction.
How do I turn a square root or π answer into a decimal?
Press ◂▸ right after the answer appears. For example √8 shows 2√2, and ◂▸ shows 2.828427125. Pressing ◂▸ again goes back to the exact form.
What is the difference between the TI-36X Pro and the TI-30XS MultiView?
Both have the MathPrint display, fractions, statistics and a function table. The TI-36X Pro adds the polynomial, system and numeric solvers, d/dx, ∫, complex numbers, number bases, constants and conversions.
Why do some constants differ from my handheld?
The handheld's built-in table uses older values, for example Planck's constant as 6.62606896E−34 J s. This page uses CODATA 2022, where h is exactly 6.62607015E−34 J s, so answers can differ in the sixth or seventh digit.