The GED Calculator: TI-30XS Rules and a Free On-Screen Version

The calculator

TI-30XS MultiView

Math Part 1

No calculator (~5 questions)

Math Part 2

On screen (~41 questions)

Bring your own?

Yes, at a test center

The calculator rules, part by part

The math test is called Mathematical Reasoning: 115 minutes, about 46 questions, split by GED Testing Service into two parts with a three-minute break between them. That split is the whole calculator story.

Part 1: about five questions with nothing but your head

The test opens with a short stretch where the calculator is simply not there. GED Testing Service describes it as roughly five mental-math questions. They are not hard questions. They are questions you can do — if you have done arithmetic unaided in the last six months.

That is the trap. Students practice with a calculator in hand for weeks, then lose marks in the first five minutes on times tables and fraction arithmetic. Our full-length practice test locks the calculator for the same opening stretch.

Here is something the internet reports as fact that GED Testing Service does not: that once Part 2 starts you cannot go back to Part 1. It is repeated on large prep sites. We checked the calculator reference sheet, the calculator blog post, the test-subjects page and the 2025 Policy Manual on September 14, 2026 and none of them addresses it. So treat it as likely but unconfirmed, and finish Part 1 properly before you move on.

Part 2: the on-screen TI-30XS MultiView

After the break the calculator appears on screen for the rest of the test (about 41 questions). It is a TI-30XS MultiView, a scientific calculator, and GED Testing Service says it comes with your test as a digital version. You do not need to buy anything. Texas Instruments describes the model as a four-line display that shows fractions the way a textbook does, with a toggle key for switching an answer between its exact form and a decimal.

Practice on a scientific calculator rather than on a phone. A phone has no fraction key and no toggle key, so everything you learn on it has to be relearned when it counts.

Can you bring your own calculator?

You have the option of bringing a TI-30XS hand held calculator.GED Testing Service, “What to Expect on Test Day”

At a test center, yes — and only that model. The 2025 Policy Manual allows a handheld TI-30XS MultiView for Math, Science and Social Studies. No graphing calculator, no other scientific calculator, no phone.

Should you? Only if you already own one and have used it. A borrowed calculator you have never touched is worse than the on-screen version you practiced with, because the keys sit elsewhere and you will hunt for them with the clock running.

Testing online? The on-screen calculator only

If you take the GED online with a remote proctor, the rules tighten. GED Testing Service's online-testing page says you cannot use a physical calculator; the built-in on-screen one is what you get. The same page says you cannot use scratch paper or take physical notes either, so the note boards you would get at a center are not part of the online setup. Your formula sheet arrives as a drop-down on screen.

If you test online, the on-screen calculator is the only tool you have, which is a good argument for spending twenty minutes on the drills above rather than five.

A key-by-key reference

Twelve keys carry almost all of GED math. Here is what each one does, and how each one goes wrong.

Two things you will read that are wrong

The advice about this calculator is unusually messy online, and two mistakes turn up again and again.

“You cannot bring your own calculator to the official test.” You may read this on prep sites that otherwise know their stuff. It is not what GED Testing Service says. The test-day FAQ gives you the option of bringing a handheld TI-30XS, and the 2025 Policy Manual allows it for Math, Science and Social Studies. The claim is only true for the online-proctored test, where no physical calculator is permitted, which is probably where the confusion started.

“The calculator is available on Part 1.” You will find this stated plainly on ranking pages, sometimes in a tip box a few lines away from a paragraph that correctly says Part 2. It is backwards. Part 1 is the no-calculator part (about five questions) and the calculator arrives for Part 2. Getting this wrong in your head costs you real marks, because you will have practiced the wrong five minutes.

One reason the second mistake spreads: the official page answering “can you use a calculator on the GED math test” names the model and says it is on screen, but never says which part allows it.

What else is on your screen and your desk

The calculator does not arrive alone. Two reference sheets come with it, and at a test center, something to write on.

• The one-page TI-30XS Calculator Reference Sheet. It covers order of operations, percentages, scientific notation, the fraction key (answers come back reduced), mixed numbers, powers and roots, and the toggle key, which takes a fraction to a decimal, an exact root to a decimal, and exact pi to a decimal. A Spanish version is published too. Read it in advance, so it is familiar by the time it counts.
• The math formula sheet. On paper at a test center, through a drop-down online. Area, perimeter, volume, surface area, slope, the quadratic formula, the Pythagorean theorem, simple interest and distance equals rate times time. It does not carry compound interest, percent change or unit conversions.
• Three erasable note boards and a marker at a test center. That is your scratch paper, and it is what you use for Part 1.

Arrive at the center at least fifteen minutes early with a non-expired government photo ID. The calculator is the easy part of the day; the paperwork catches people out.

When to put the calculator down

A calculator is a speed tool, not a thinking tool, and on a timed test it can cost you time as easily as save it. Typing 400 divided by 8 takes longer than knowing it is 50.

GED Testing Service’s own math content specialist puts non-calculator items on a list of four areas where test-takers come up short, alongside exponents and roots, three-dimensional shapes and compound probability.GED Testing Service, Math Knowledge & Skill Gaps, Session 1

Three times to leave it alone. When the answer choices are spread out. If the options are 12, 40, 120 and 400, an estimate beats an exact calculation. When the question asks which expression is correct. There is nothing to compute, only a setup to read. When you can see the answer. Half of a half is a quarter, ten percent of 60 is six, and no keypad is faster than that.

The fix is the same for all three: drill the arithmetic until it is automatic, then let the calculator handle the ugly numbers. Short sets on one skill at a time do that faster than another full test. Then take the timed full-length test and see where you land against the 145 you need to pass.