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What is Mathplanet?
Mathplanet is a free online platform for studying high-school mathematics, offered by Selenite. Its stated curriculum centers on four courses: Pre-algebra, Algebra 1, Algebra 2 and Geometry.
Who it suits
- High-school students who want a structured course sequence rather than scattered practice problems.
- Homeschoolers or self-paced learners who need a free spine for pre-algebra through geometry.
- Parents or tutors looking for a low-cost supplement to classroom instruction.
What to expect
The platform describes itself as free and accessible, with courses organized by subject level. That makes it most useful as a primary study path for the topics it covers, or as review material before a placement test or next course. Because the catalog is limited to those four areas, students needing calculus, statistics or exam-specific prep such as SAT or ACT practice would need to look elsewhere.
A practical next step
Open the Pre-algebra or Algebra 1 course page and work through the first lesson to judge whether the explanations and pacing fit your level. If you are preparing for a specific exam, first check whether the topic you need appears in the four listed courses; if not, treat Mathplanet as background review and find dedicated test-prep material separately.
For a broader catalog that includes science, English, history and test preparation, Khan Academy covers more subjects, while Math Is Fun offers lighter, topic-by-topic explanations that pair well with a structured course.
Which high school math courses does Mathplanet offer?
Mathplanet offers four high school math courses: Pre-algebra, Algebra 1, Algebra 2 and Geometry. That is the full course list given for the site, so it is best understood as a focused algebra-and-geometry track rather than a broad catalog covering trigonometry, precalculus, calculus or statistics.
The natural audience is a high school student who needs clear explanations and practice on foundational topics, or a parent, tutor or teacher looking for a free supplementary resource. It is also a reasonable fit for an adult learner reviewing the basics before moving on to more advanced material.
If you are deciding whether it matches your needs, check the course that corresponds to your current class. Pre-algebra and Algebra 1 suit early high school or students shoring up fundamentals; Algebra 2 and Geometry fit later high school coursework. If you need calculus, statistics or exam-specific preparation, this set of courses will not cover it, and you should look for a broader platform such as Khan Academy.
A useful next step is to open the course matching your current unit, work through one lesson and its practice problems, and judge whether the pacing and depth suit you before committing to the whole course.
Is Mathplanet really free to use, or are there hidden costs?
Yes. Mathplanet is presented as a free platform for learning mathematics, with high school courses in Pre-algebra, Algebra 1, Algebra 2 and Geometry. The supplied page evidence shows no pricing signals, no payment links and no payment platforms, so there is no indication of a paywall, subscription or hidden fee for those courses. The main cost is your time: you work through lessons and examples at your own pace rather than paying for live instruction.
That said, "free" does not mean it replaces every paid option. Mathplanet is best understood as a self-study resource for core high school topics. A learner who needs graded homework, a teacher to ask questions, or a formal certificate will likely need something else alongside it.
Practical example: a student preparing for an Algebra 1 test could use Mathplanet to review topics and then check understanding with free practice from Khan Academy. If a parent wants structured live classes or tutoring, that is a different kind of service and may cost money; Mathplanet itself is not that.
If you want to confirm there are no costs, start with one course, work through several lessons, and see whether anything asks for payment or an account upgrade. If nothing does, you can treat it as free for your purposes.
How can I use Mathplanet to prepare for the SAT or ACT?
Mathplanet is built around free high school math courses — Pre-algebra, Algebra 1, Algebra 2 and Geometry — so the realistic way to use it for SAT or ACT prep is as a math-foundations trainer, not as a full test-prep program. It drills the underlying skills the exams assume you already have; it doesn't simulate the test itself.
What it can genuinely do for you
- Rebuild weak foundations. If your arithmetic, fractions, exponents, linear equations or basic geometry are shaky, working through Pre-algebra and Algebra 1 in order fixes the gaps that cause most careless SAT/ACT math errors.
- Fill specific holes. Use the topic structure to jump straight to a weak area — say, systems of equations or coordinate geometry — rather than starting at lesson one.
- Free, self-paced practice. There's no cost barrier, so you can use it alongside a paid course or a test-prep book without duplicating expense.
What it won't do
- No full-length timed SAT or ACT practice tests, no adaptive question bank, no score prediction.
- No reading, writing, grammar or science sections — the ACT in particular tests those heavily.
- No test-specific strategy: plugging in numbers, back-solving, pacing, or when to guess.
A practical way to combine it
Take one official practice test first to find your weak math topics. Then spend two to three weeks per weak topic on Mathplanet lessons, and re-test to confirm the gain. Pair it with a source of real exam-style questions, such as Khan Academy for its official SAT math practice, ACT for the official ACT question archive, or College Board for SAT practice tests. If you want structured tutoring or a full course, Revolution Prep is one commercial option.
Decision rule: if your practice-test math score is already near your target and your errors are careless or timing-related, Mathplanet won't help much — you need timed exam practice. If your errors are conceptual, start here.
Can Mathplanet help me with my algebra or geometry homework?
Yes — if your homework is at the high-school level and you want to understand the method rather than just get an answer. Mathplanet is a free platform built around high-school math courses, specifically Pre-algebra, Algebra 1, Algebra 2 and Geometry, so algebra and geometry homework fall squarely inside what it covers.
How it fits a homework session
- Concept review first. When you're stuck on a problem, the usual cause is a rule you half-remember. Read the matching lesson section, then retry the problem yourself.
- Algebra 1 and Algebra 2 suit equation solving, factoring, functions, exponents and similar procedural topics, where a worked explanation is often enough to unblock you.
- Geometry suits definitions, theorems and reasoning about shapes, where seeing the property stated clearly matters more than drilling.
- Pre-algebra covers the gaps that make later algebra feel impossible — fractions, negative numbers, order of operations.
What it won't do
It's lesson material, not a problem scanner or a step-by-step solver for your exact worksheet. It won't check your answers, and it isn't a substitute for your teacher's method if your class uses a particular notation or approach. If your homework is calculus, statistics or college-level proof writing, this isn't the right stop.
A practical next step
Take the one exercise you can't finish, identify the single operation or theorem you're unsure about, and read only that section — then close the page and redo the problem from scratch. If you can now do it without looking, you've learned it. If you can't, the gap is earlier than you thought; step back one level (for example, from Algebra 2 to Algebra 1) and check the prerequisite skill.
Decision criterion
Use Mathplanet when you need an explanation you can read at your own pace for free. Use your textbook, class notes or teacher office hours when your homework requires the specific method your course is graded on. For a broader catalogue of free lessons and practice across many subjects and levels, Khan Academy is a common companion.
What should I do if Mathplanet says my device is not supported?
If Mathplanet shows "your device is not supported!", the page has detected a browser or device it cannot run on—it is not a sign your account or the lessons are broken. In most cases the fix is to change how you are viewing the site rather than to change what you are studying.
Try these in order
- Rotate to landscape or resize the window. The message itself asks you to rotate your screen, which suggests the layout is designed for a wider viewport. On a phone, turning it sideways often clears the block; on a desktop, widening the browser window or leaving full-screen mode can do the same.
- Switch browsers. Try a current version of Chrome, Firefox, Safari or Edge. Older or embedded browsers—including the in-app browser inside some social and messaging apps—are the most common culprits. Open the link in your main browser instead of tapping it inside an app.
- Update your browser and operating system. An out-of-date browser may lack features the page relies on.
- Turn off content blockers or strict privacy modes. Aggressive tracking protection and script blockers can prevent the page from finishing its checks.
- Try another device. If a laptop works and a phone does not, the problem is the device/browser combination, not the site as a whole.
If it still fails
Use a desktop or laptop for the lesson you need, and keep a phone or tablet for review. Mathplanet's material is organized as high school courses in Pre-algebra, Algebra 1, Algebra 2 and Geometry, so a stable desktop session is the more reliable place to work through a full unit. For a second explanation of the same topic, Khan Academy covers overlapping algebra and geometry material with its own device requirements, which is useful when one platform refuses to load.
As a practical test: open one lesson page in a different browser on the same device. If it loads, stay in that browser; if it does not, move to a computer before assuming the course content is unavailable.
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