Classroom Math Games: Race to 24
One of the easiest classroom math games to run: project each round on the big screen, students join from their own devices with a 6-digit code, and the whole class races to make 24. No installs, no player accounts — it runs on school Chromebooks.
Host a live game for your class
Signed-in hosts can create a room in one click and share the code.
Students: join with a code
Your teacher shared a 6-digit room code? Type it here, then pick a nickname.
Only two players? The same rooms run one-on-one duels — open the join page.
Why teachers play it
Zero setup, any device
Students join from a phone, tablet, or school Chromebook with just the code and a nickname — no app to install, no accounts to create.
Live standings on the projector
The room screen shows a live ranking and the QR code to join, so the whole class sees who solved first. The teacher can play along from the same screen.
Mental math that feels like a game
Four numbers, one goal: combine them with + − × ÷ to make 24. Every round deals a fresh hand, so practice never goes stale.
How to Run Classroom Math Games
- 1
Create a room
Sign in, tap create, and the room code plus QR code appear on the projector view.
- 2
Students scan in
The class scans the QR code or types the 6-digit code, picks a nickname, and lands on the waiting screen.
- 3
Race to 24
Start the match — each round deals four new numbers, and the first correct answer wins the round.
Before class
Hosting needs one teacher account — free to create, email and password, nothing more. Students never sign in: they open the join page, type the code, pick a nickname, and they are in. Open the room on the projector and every round lands on the big screen while the class plays from their own devices — and you start each round from that same screen.
Not enough devices?
Pair students up on one screen. One partner proposes the operations, the other checks them, then they swap roles next round — shared devices keep the whole class in the race without leaving anyone out.
How many rounds to run
A match is a string of rounds, and the standings carry across them — each round deals a fresh hand, the first correct answer takes it, and the ranking updates on the projector in real time. Short works: a quick burst fits the last minutes of a lesson as cleanly as a warm-up. Long works too: on a review day, let the room run and read the standings at the end. The natural stopping point is when the class still wants one more — that is the note to end a math class on.
How long a room lives
A 6-digit room code stays valid for 24 hours after you create it — one room covers a morning warm-up and an afternoon review. Up to 20 players can join a room, so a full class races together on one board.
After the round: reading the results
The standings update live while the class plays, so the projector already tells the story — who solved first, who streaked, who went quiet. When the match ends, pull up the hands that stumped everyone in the solver and walk the class through the route the fastest student took. Your past rooms and results stay available under settings, ready for the next parent night. A pattern emerges fast: the hands the class argues about are the ones worth printing for tomorrow's warm-up — the live game hands you your next paper exercise.
When to race, and when to print
Classroom math games earn their keep on the days you need energy: a Friday bonus round, a warm-up that wakes the room up, a review day that would otherwise be a worksheet grind. The live room is built for exactly that — one projected board, everyone racing, standings on the screen.
Print wins when you need quiet or independence: homework, substitute plans, early-finisher folders, or classrooms where devices are scarce. The worksheet generator prints sheets with answer keys from a deterministic seed — the same seed always prints the same sheet, so two classes can work the identical practice. For assessment, collect the seed printed on each sheet: it reprints the exact same page for a retest or an absent student.
The two modes draw on the same hand library and difficulty tiers. A hand that caused an argument in the live race can be settled in the solver afterwards, or found again in the full solution archive — same numbers, same answers, calmer setting. The archive is also where the famously hard hands live, so it is the place to find a hand guaranteed to start tomorrow's argument.
Frequently asked questions
How many students can join one room?
Up to 20 players share a room. For a bigger class, open two rooms and split the group — each room has its own live standings, which turns the two halves into a natural head-to-head. Twenty is also the number that keeps one scoreboard readable from the back row.
Do students need accounts?
No. Students join with the 6-digit room code and a nickname — nothing to install, nothing to register. Only the teacher hosting the room signs in, and the nickname is just for that room's scoreboard.
What devices does it work on?
Anything with a browser: school Chromebooks, tablets, phones, laptops. The projector needs no special hardware either — the room screen is just a web page. Everything runs in the browser tab, so there is nothing to configure on school-managed devices.
Which grades is it for?
Elementary and middle school are the sweet spot — the same four-number game teachers run from grade 3 up. Hands come from the site's difficulty tiers, so a room can stay gentle for beginners or stretch strong students. For a first run, keep the hands easy; move up a tier once the class is warmed up.
Can we project it on the big screen?
Yes — the room screen is built for the projector: the current hand shown large, the live ranking, and the QR code students scan to join. You host from that same screen and start each round when the class is ready. No dongles, no installed apps — if the projector can show a web page, it can show the room.
What if a student loses the room code?
The code and QR stay on the projector's room screen for the whole match, so nobody is locked out by a lost sticky note. Codes stay valid for 24 hours — a morning room still works for afternoon review. The QR does the same job from a phone camera: point it at the projector and the join page opens with the code already filled in.
Is it really free?
Yes. Hosting rooms, joining, the worksheet generator, the solver and the daily puzzle are all free tools on this site — no student accounts, no installs, nothing to buy for the classroom loop. If you can open this page, you can run it.