99math is a free multiplayer math game that turns short arithmetic drills into a live classroom race. A teacher picks a skill, launches a game, and shares a code. Students join from any device with no account, then answer questions as fast and accurately as they can while a leaderboard runs in real time. It was founded in 2018 in Tallinn, Estonia, by Timo Timmi and his co-founders, and it now covers more than 1,000 skills for grades 1 to 8, including addition, subtraction, multiplication, division, fractions, and decimals.
How a live game works
The core mode is Live Group Practice. The teacher creates a free account at 99math.com, picks a grade and a skill, sets a time limit, and presses Play LIVE. Students open join.99math.com on a Chromebook, iPad, or phone, type in the code, and pick a nickname. No student account is needed, which removes the usual classroom delay of passwords and logins.
Once the game starts, every child answers questions on their own device at the same time, and the shared screen shows the leaderboard moving live. A round usually lasts only a few minutes, which keeps the energy high and fits into a lesson as a warm up or a finish. A live game needs at least three players, and there is no upper limit, though a weak internet connection can limit how many children play at once. 99math also runs Math Game Day, a global event where students from different countries compete in live math battles.
Who 99math is for
99math is built for elementary and middle classrooms, grades 1 to 8, and for parents who want quick fact practice at home. It is a fluency tool, not a full curriculum: it works best after the teacher has taught the idea, so it should not be used to introduce a new concept. The practice is organised by skill, including addition, subtraction, multiplication, division, fractions, decimals, integers, mixed operations, place value, number sense, and order of operations.
The platform also offers homework through Individual Practice and home use through Home Practice, which parents can set up for their children. The mobile app is listed mainly for grades 1 to 6, while the classroom platform covers grades 1 to 8.
What is free and what costs money
The free version is genuinely functional. It includes the full Live Group Practice mode, Individual Practice, and Home Practice, plus access to all 1,000+ math skills, Google Classroom and Clever integration, and basic reports. Students join free and need no accounts.
| Feature | Free | Teacher Premium |
|---|---|---|
| Live group games | Yes | Yes |
| Skills library | All 1,000+ skills | All 1,000+ skills |
| Mixed skill games | No | Yes |
| Personal learning paths | No | Yes |
| Common mistake analysis | No | Yes |
| Detailed printable reports | Basic | Yes |
Teacher Premium covers one teacher with unlimited students. School Premium covers unlimited teachers and students at one school and adds priority support, with pricing by quote. Parents pay through a separate subscription for the app, which adds rewards, avatars, and collectibles.
How to start a game in three steps
- Create a free teacher account at 99math.com. Google login takes about 30 seconds.
- Pick a grade and a skill from the library, set the round time, and press Play LIVE.
- Share the code. Students go to join.99math.com, type the code, choose a nickname, and play.
After the round, the teacher dashboard shows who answered what, so gaps are visible at once and the next lesson can target them.
What 99math does not do
99math builds fluency, not understanding. It has no geometry proofs, no algebra word problems, no statistics or probability, and no visual models for learning a new idea from zero. If a child does not yet understand what multiplication means, 99math will drill them on facts they have not learned. Use it after the teaching, not instead of it. The platform says it complies with GDPR and COPPA and acts as a school official under FERPA when used by schools.
99math vs Prodigy Math
99math and Prodigy Math both make math practice feel like a game, but they work differently. 99math is a short live race: the whole class plays the same skill at the same time, the round lasts minutes, and the teacher watches the leaderboard live. Prodigy Math is a long adventure: each child plays their own wizard through quests and battles, the game adapts to their level, and progress builds over weeks. A teacher who wants a five minute energy burst at the start of a lesson will pick 99math. A parent who wants a child to practise on their own for twenty minutes after school will pick Prodigy. If you want the full picture of the adventure side, read what Prodigy Math is and who it is for, and for the duel style of play, see Prodigy friends and duels.
Frequently asked questions
Is 99math free?
Yes. The free version includes live group games, individual practice, and home practice, with access to all 1,000+ skills. Premium adds mixed skill games, personal learning paths, common mistake analysis, and deeper reports.
How do students join a 99math game?
Students go to join.99math.com, type in the game code the teacher shares, and pick a nickname. No account is needed, and they can join from a Chromebook, iPad, phone, or shared tablet.
What grades is 99math for?
Grades 1 to 8. The skills cover addition, subtraction, multiplication, division, fractions, decimals, and introductory algebra. The mobile app is listed mainly for grades 1 to 6.
What is a 99math code?
The code is the short room code the teacher shares when launching a live game. Students enter it at join.99math.com to enter that game. Each game has its own code.
Is 99math a full math curriculum?
No. It is a fluency practice platform. It builds speed and accuracy on arithmetic facts after the idea has been taught, but it does not teach new concepts, and it does not cover geometry, statistics, or word problems in depth.
This site is an independent guide. It is not the official 99math or Prodigy site, and it is not affiliated with 99math or Prodigy Education.