DeltaMath.cc is a free resource designed to complement classroom instruction through unlimited practice and intelligent feedback.
DeltaMath.cc provides free, unlimited mathematics practice with an intelligent feedback system designed to support student learning. Unlike traditional worksheets or drill-and-practice software, our platform uses randomized problem generation and error-specific feedback to create a learning experience that adapts to student mistakes and guides them toward understanding.
The platform requires no registration, no accounts, and no payment. Students can access practice problems directly through any web browser, making it easy to integrate into your existing classroom routines. Simply share a link to a specific topic, and students can begin practicing immediately.
This resource is designed to complement, not replace, quality classroom instruction. It works best when students have already received initial teaching on a concept and need additional practice to solidify their understanding. The randomized problem generation ensures that students engage with the underlying mathematical concepts rather than memorizing specific answers.
DeltaMath.cc can be integrated into your instructional practice in several ways, depending on your classroom needs and teaching style:
Assign specific topics for students to practice outside of class time. Because problems are randomly generated, students cannot simply copy answers from one another — they must engage with the mathematical process. You might assign practice by telling students to "complete 15 problems on one-step equations" or "practice until you get 10 correct in a row." The immediate feedback means students do not have to wait until the next class period to know if they are on the right track.
During class, you can set up stations where students practice independently while you work with small groups. The intelligent feedback reduces the need for you to check every problem, freeing you to provide targeted instruction where it is most needed. Students who need more challenge can work on Medium difficulty, while those who need reinforcement can build confidence on Easy problems.
Before quizzes or tests, direct students to practice specific skills they will be assessed on. The random problem generation means students are genuinely practicing the skill rather than memorizing particular problems. This leads to better transfer of knowledge to assessment situations where they will encounter novel problems.
Regularly assign previously taught topics to maintain skill retention over time. The spacing effect in learning research shows that distributed practice over time leads to stronger long-term memory than massed practice. Having students periodically return to earlier topics helps prevent the common problem of students forgetting material after a unit ends.
The self-directed nature of the platform makes it suitable for days when a substitute teacher is covering your class. Leave instructions for students to practice specific topics, and the intelligent feedback will guide their learning even without your direct supervision.
The design of DeltaMath.cc is grounded in research-backed principles of effective mathematics instruction:
Research consistently shows that students learn mathematics more effectively through active problem-solving than through passive observation. Each problem on DeltaMath.cc requires students to engage actively with the material, make decisions, and construct their own understanding through the problem-solving process.
The effectiveness of practice is significantly enhanced when feedback is immediate rather than delayed. When students receive feedback right after attempting a problem, the connection between their thinking process and the outcome is strongest. This allows for immediate correction of misconceptions before they become ingrained.
Rather than simply marking answers as correct or incorrect, our feedback system attempts to identify the specific type of error a student made. This approach treats errors as valuable diagnostic information rather than simply failures. When a student sees "sign error detected" rather than just "incorrect," they gain insight into their thinking process and can make targeted corrections.
By generating new numbers for each problem, the platform prevents students from relying on answer memorization. This pushes students toward understanding the underlying procedures and concepts, which leads to better transfer to new situations and long-term retention.
At the core of DeltaMath.cc is an intelligent feedback system that analyzes student responses to provide targeted guidance. This system goes beyond simple answer checking to identify common error patterns and misconceptions.
When a student submits an answer, the system compares it to the correct solution while also checking for common mistake patterns. For example, if the correct answer is -5 and the student enters 5, the system recognizes this as a likely sign error and provides feedback specifically about checking positive and negative signs. If a student solving 3x = 15 enters 45 instead of 5, the system may recognize they multiplied instead of divided.
The feedback messages are designed to be instructive rather than evaluative. Instead of simply telling students they are wrong, the messages guide students toward understanding what went wrong and how to correct it. This approach supports a growth mindset by treating errors as learning opportunities rather than failures.
Examples of targeted feedback: "Sign error detected — check your positive and negative signs." "You may have forgotten to divide both sides." "Distribution mistake — remember to multiply each term inside the parentheses." "Close! Check your arithmetic." "This fraction can be simplified further."
DeltaMath.cc currently covers foundational topics typically taught in grades 6-9, with content organized in a logical progression:
Each topic includes two difficulty levels. Easy problems use smaller, positive integers and simpler scenarios. Medium problems introduce larger numbers, negative values, and more complex situations. This allows for differentiation within each topic area.
We understand that student privacy is a paramount concern for educators. DeltaMath.cc was designed with privacy as a core principle:
No student accounts required. Students do not need to create accounts, provide email addresses, or share any personal information to use the platform. They simply visit the website and begin practicing.
No persistent data collection. We do not track individual student performance over time. The statistics shown during a practice session (correct, incorrect, streak) exist only in the browser during that session and are not stored on any server.
No personally identifiable information. Because there are no accounts and no tracking, there is no personally identifiable information to protect or potentially expose.
No third-party advertising or tracking. The platform does not include advertisements or third-party tracking scripts that might collect data about students.
Note for administrators: Because DeltaMath.cc does not collect student data, it does not require the data privacy agreements that many educational technology platforms necessitate. However, we recommend reviewing the platform yourself to ensure it meets your district's policies for web-based instructional resources.
The trade-off of this privacy-first approach is that teachers cannot track individual student progress through the platform. For formal progress monitoring and assessment, you would need to use other tools. DeltaMath.cc is best viewed as a practice resource that complements your assessment and tracking systems rather than replacing them.
Integrating DeltaMath.cc into your instruction is straightforward:
We welcome feedback from educators on how we can better support classroom instruction. If you have suggestions for additional topics, improvements to the feedback system, or other features that would benefit your students, please reach out through our contact page.
See how DeltaMath.cc can support your students' mathematical development.
Browse Topics Student Guide