To prepare for GED Mathematical Reasoning, spend your hours the way the test spends its questions: slightly more on algebra than on everything else put together. GED Testing Service builds the test from two content strands — Quantitative Problem Solving, about 45% of it, and Algebraic Problem Solving, about 55% — and publishes a weighting for each of the four categories your score report breaks out. Those weightings, not a topic list, should decide what you study.
Brilliant is the understanding layer here and GED Testing Service’s own materials are the exam layer. Brilliant teaches most of the mathematics the test describes, by making you solve problems rather than watch explanations. It does not teach the exam: no format walkthrough, no timing practice, no full-length test. A good plan uses both.
What does the GED math test actually test?
The Mathematical Reasoning test has two content strands, divided into 15 assessment-target clusters holding 62 content indicators. GED’s own shorthand for the topics is Basic Math, Geometry, Basic Algebra, and Graphs and Functions. Total testing time is 115 minutes, which includes two minutes of instructions and final review and a three-minute break between the two parts, and GED’s own math overview puts the test at about 46 questions.
Your score report groups the same 62 indicators a second, coarser way, and this is the grouping worth planning around: quantitative problem solving with rational numbers (25%), quantitative problem solving in measurement (20%), algebraic problem solving with expressions and equations (30%), and algebraic problem solving with graphs and functions (25%). About half the items are written to Depth of Knowledge level 2, and about 30% of them are aligned to a GED Mathematical Practice — a reasoning behavior such as building a solution pathway — in addition to a content indicator.
Two logistics change how you prepare. You are given a formula sheet, on screen and in the test center, so the geometry work is applying formulas rather than recalling them. And you get an on-screen TI-30XS MultiView scientific calculator for most items, on part 2 of the test; you may also bring your own TI-30XS to a test center.
Just as useful is what is not on the test. There is no trigonometry — right triangles appear only through the Pythagorean theorem. There is no calculus, no matrix algebra, no vectors, no complex numbers, no polar coordinates, and no logarithms. Exponential and logarithmic function families, two-variable inequalities, transformations, the distance formula, conic sections, conditional probability, expected value and regression are all absent. If you found Brilliant through Exponential Functions, Logarithms, Trigonometric Functions, Vectors, Complex Numbers or Calculus, none of them is worth a GED hour.
The passing score is 145 in each subject; above 165 is GED College Ready, and above 175 is College Ready plus Credit, worth up to 10 college credit hours.
Which of that math does Brilliant teach?
Most of it. Brilliant lessons reach 56 of the 62 content indicators — 346 matched skills across 687 distinct lessons in 26 courses.
- Rational numbers and number sense. Fractions and common denominators in Fractions, signed arithmetic and order of operations in Negative Numbers, exponent rules, roots and scientific notation in Exponents and Radicals, ratios and unit rates in Proportional Reasoning, percent increase, decrease and reversal in Percents, and scaling prices and taking a percent of an amount in Real-World Algebra.
- Measurement, data and probability. Perimeter, circumference, surface area and volume in Geometry and Measurement, area and the Pythagorean theorem in Coordinate Geometry, bar charts, histograms and box plots in Exploring Data Visually, mean, median and weighted averages in Everyday Statistics, and compound-event probability in Probability and Chance.
- Expressions and equations. Combining, distributing and factoring in Solving Equations, multi-step and fractional-coefficient equations in Linear Equations, polynomial arithmetic in Polynomials, factoring, completing the square and the quadratic formula in Quadratics, two-equation systems in Linear Systems, and using and writing formulas in Real-World Algebra.
- Graphs and functions. Slope, intercepts, graphing lines and writing their equations in Linear Relationships, and function rules, domain, range and function notation in Introduction to Functions.
The indicator-by-indicator version of this is on the GED math coverage page.
Where is Brilliant strongest for the GED?
On the algebraic side, which is also the larger half of the test: 200 of the 346 matches fall there. Quadratics (80 lessons) now has the most matches of any course, ahead of Linear Equations (68 lessons), with Exponents and Radicals and Solving Equations behind them. If your practice score is held down by the algebra questions, this is the part of the catalog that will move it.
What will you not get from Brilliant?
The gap that used to matter most here has closed. Writing a quadratic equation from a described situation — a projectile’s height, an area problem stated in words — had no home on Brilliant until Quadratics added its motion and applications work; Motion Under Gravity and Applied Quadratics now start from the situation and ask for the equation, which is exactly what the GED asks for. What is left are five smaller absences, each cheap to pick up elsewhere:
- Unit conversion. The GED puts “converting units of measure” inside its multi-step proportion indicator, and Brilliant teaches no measurement-unit conversion anywhere in its math catalog — not inches to feet, not minutes to hours.
- Spheres and composite solids. Geometry and Measurement covers prisms, cylinders, pyramids and cones, but nothing computes the volume or surface area of a sphere, and nothing decomposes a solid built from two shapes.
- Rational expressions, two of the three ways the GED asks for them. Brilliant adds and simplifies them in Equations and Curves; it does not evaluate one by substituting an integer, and it does not write one from a description.
- Unit rate read as slope. Brilliant computes unit rates and graphs linear relationships, but the lessons that graph a rate carry a non-zero starting value, so none of them lands on the GED’s “unit rate as the slope of a proportional relationship.”
- Number properties. Least common multiple, greatest common factor and rewriting a numeric expression with the distributive property have no direct home; prime factorization is as close as the catalog gets.
And the exam layer, which Brilliant does not attempt: the on-screen interface, the formula sheet’s contents, pacing across 115 minutes, and full-length practice.
What should you study, and in what order?
Work the heaviest scoring category first. The order below is by weight, not by the order the strands appear in the test.
| Reporting category | What it asks for | Start here |
|---|---|---|
| Algebra: expressions and equations — 30% | Linear and polynomial expressions, one-variable linear equations, two-equation systems, one-variable inequalities, quadratic equations | Combining Like Terms |
| Quantitative: rational numbers — 25% | Ordering and computing with fractions, decimals and signed numbers, exponent rules, ratios, proportions, percent and simple interest | Adding Fractions |
| Algebra: graphs and functions — 25% | Points and slope, graphing lines, reading key features off a graph, equations of lines, function notation | Change per One |
| Quantitative: measurement, data and probability — 20% | Perimeter, area, circumference, surface area and volume from the formula sheet, the Pythagorean theorem, data displays, averages, probability | Perimeters |
If fractions and signed numbers are rusty, do the second row first — the algebra rows assume that arithmetic, and it quietly costs you points until it is solid. If you are short on time, pick the row your practice test hurt you in, open individual lessons rather than completing courses, and leave the rest. Brilliant lessons are short and stand on their own.
What should you use from GED Testing Service?
Use ged.com for everything about the test itself — the subject outline, the calculator and formula-sheet policy, scheduling, and what each score threshold means. The weightings quoted above come from its Assessment Guide for Educators: Mathematical Reasoning, which is free and worth skimming to see the whole syllabus in one place. Use whatever official practice material you can get for timed, full-length work: that is the half Brilliant does not supply.
A workable rhythm is to alternate. Take a timed official practice section, list what you missed for a math reason rather than a timing reason, then use Brilliant on exactly those topics before the next one.
Is Brilliant a complete GED prep course?
No. Brilliant is not a GED prep course, is not affiliated with or endorsed by GED Testing Service, and does not include practice tests, timing drills, or score guarantees. It teaches the mathematics the test is checking you on. Use Brilliant for the math and GED’s official materials for the exam, and you have both halves.
How this mapping was made
Brilliant’s curriculum team maps skills to the GED’s content indicators skill by skill against the live course catalog, using GED Testing Service’s Assessment Guide for Educators: Mathematical Reasoning as the authority on what each assessment target requires. The data behind this page was pulled on September 23, 2026 and reflects the catalog on that date.
Frequently asked questions
I have not done math in years. Where do I actually start?
With Fractions and Negative Numbers, and without embarrassment. Brilliant’s course grade labels describe when students usually first meet the material, not who the course is for, and rational-number arithmetic is a quarter of your score.
Do I need to learn trigonometry for the GED?
No. The test has no trigonometric ratios, no unit circle and no identities. The only right-triangle content is the Pythagorean theorem, which Coordinate Geometry teaches.
Does Brilliant cover the geometry formulas?
It teaches the measurement work — perimeter, area, circumference, surface area, volume — and you are given the formulas at the test anyway. The exceptions are spheres and composite solids, which Brilliant does not teach.
How far ahead of the test should I start?
Far enough that concept work is not competing with timed practice. Brilliant is best while you are still learning math you do not know; in the last couple of weeks, official practice and error review are the better use of your hours.
Related resources
- GED math coverage: Brilliant lesson mapping by assessment target
- How to prepare for the TSI (TSIA2) math test
- What math does Brilliant cover?
- Does Brilliant cover Algebra 1?
- Explore Brilliant’s courses
Sources
[1] GED Testing Service, Assessment Guide for Educators: Mathematical Reasoning, and the test subjects, mathematical reasoning and scores pages at ged.com, accessed September 2026.
[2] Brilliant, standards alignment database, pulled on September 23, 2026.
[3] Brilliant, “GED math coverage: Brilliant lesson mapping by assessment target”, accessed September 2026.
[4] Brilliant, “Courses”, accessed September 2026.
