Lemma Math Step Checker
Algebra-verified step checks
Each step is checked by a symbolic algebra system, and a line it cannot read is marked not verified. Paste or type your steps for algebra, pre-algebra, percents, college algebra, ALEKS® placement test topics or TEAS® math (the nursing entrance exam math section), and ask "check my work", "show my work" or "where did I go wrong". Lemma marks each step as correct, doesn't follow, or not verified, shows the first step where the work breaks, names the mistake when it can prove one, and gives a hint without handing over the answer. It shows the final answer only if you ask after trying. Ask for a fresh practice problem on the same topic and check your steps on it too. Each result links to a matching practice page on lemmamath.app, and a study-plan tool lays out topics week by week up to your test date. Built for adults returning to math. Limits: it checks whether each step is mathematically equivalent to the line above it, so it does not grade graphs or proofs; equations with variable denominators or roots are marked not verified when their domain restrictions cannot be checked; for a word problem, send your own equation or expression and the steps are checked from it, but whether it fits the story is not graded. Fraction coefficients should be written like (1/2)x. Lemma does not store your problem, your steps or your conversation. Independent practice, not affiliated with or endorsed by McGraw Hill or ATI. ALEKS is a registered trademark of McGraw Hill; TEAS is a registered trademark of Assessment Technologies Institute (ATI).
What you can ask
- Check my ALEKS work on 3(x - 2) = 12: 3x - 6 = 12, then 3x - 2 = 12, then 3x = 14, then x = 14/3.
Example path ·
MCP connector
- Server URL
https://lemmamath.app/mcp- Login
- None
- Protocol
- MCP 2025-11-25
- Instructions
Lemma checks a student's own math steps with a symbolic algebra system. Report its verdicts as given. If a verdict looks wrong to you, say the checker flagged that step and ask the student to rewrite it as one smaller line, rather than telling them it is definitely wrong. Offer hints before answers, and show an answer only when the student asks for it after trying.
Tools
Reads data6
Skills
1 in the ChatGPT listing
Screenshots
