Free Math Practice for Every Grade, K-12
Thousands of practice questions with instant feedback, worked-example tutorials for every topic, and an adaptive diagnostic that finds exactly where to focus. Free to start.
Free to start · No card required · K-12
Math builds on itself — a shaky understanding of fractions in Grade 4 quietly undermines algebra in Grade 8. Most practice sites just drill the current grade. ExcelOS is built to find the earlier gap and close it.
Start with a short adaptive diagnostic. ExcelOS pinpoints which foundational skills need work, then builds a personalized path from arithmetic and fractions through algebra, geometry, and calculus. Every lesson begins with a step-by-step worked example so the method is clear before the practice begins.
It's free to start, covers Kindergarten through Grade 12, and works on the web or the iOS app.
Why families choose ExcelOS
Every grade, K-12
Counting and addition through algebra, geometry, statistics, and calculus — all in one place.
Diagnostic-driven
A quick adaptive test finds the real gaps across grade levels, then builds a plan to fix them.
Worked examples first
Each topic opens with a step-by-step tutorial, so students learn the method before practicing.
Instant feedback
Immediate right/wrong feedback plus explanations on every question.
Track real progress
Mastery-based progress: advance once you've actually got it, not just attempted it.
Free to start
Create a free account and begin practicing in minutes — no card required.
Browse free lessons by subject
Frequently asked questions
Is the math practice free? +
Yes. A free account lets you take the diagnostic, follow your personalized path, and practice with instant feedback at no cost.
What math topics are covered? +
Everything from Kindergarten counting and addition to fractions, ratios, algebra, geometry, statistics, and calculus across Grades K-12.
How does the diagnostic work? +
It adapts to each answer to estimate the student's level, identifies which earlier skills need shoring up, and builds a personalized sequence of lessons.
Can I use it for homeschool? +
Yes — many homeschooling families use ExcelOS as a free, self-paced math spine with tutorials and unlimited practice.