Mental math helps people of all ages build calculation skills. It can be a thoughtful way to spend free time or a starting point for competition training. Fastmath makes mental math more fun, challenging, and accessible.
ยะนัย เลิศธนโยธิน / Creator of เลขครูยะ
Choose a level, set your time limit, and start solving. Single player is free, with no account required.
Play nowGo head-to-head in a timed match. Keep track of your wins, improve your score, and work your way up the leaderboard.
Play onlineEnter a question to find possible solutions. Follow the steps to understand the calculation and pick up ideas for your next game.
Try it for freeSee how players rank across the game.
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Use Fullscreen for in-person practice and competitions. Play on your own, train as a team, or bring the challenge to a larger event.
Save problems you want to practice again and return to them whenever you like. Your saved problems make it easy to pick up where you left off.
Enjoy Fastmath.io on your computer, tablet, or smartphone. Open your browser and keep the challenge going wherever you are.
Learn useful formulas for five-number questions with three-digit targets, with worked examples.
Discover the most versatile pairs of digits and the values they can create.
Find out how Fastmath's levels compare with competition rules.
Review the laws of exponents and useful powers for mental arithmetic.
You don’t need to be fast to get started. Pick a level that feels comfortable and practice at your own pace. Build confidence one question at a time.
A few minutes is enough for a game. Play on your own or challenge a friend. The choice is yours.
Play for freeFastmath is a mental math game inspired by the 24 Game. Use a set of randomly drawn digits to build a mathematical expression and work toward a target number. Learn more
Fastmath is for all ages and skill levels. Children can explore mathematical operations and build calculation skills, while students and other players can practice for competitions or simply enjoy a challenge.
You can play modes such as Single player and Fullscreen for free without an account.
Fastmath.io runs in your web browser, with no software to install. You can play on a computer, tablet, or smartphone.
Have a suggestion, found a problem, or need to report inappropriate behavior? Let us know through our feedback form.
Open feedback formWe regularly update Fastmath.io to improve performance and make your experience better.
Read the release notesFor in-person events, access to our platform, or other questions, email us at
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