Divisible Dash, in one page
An arcade game that drills the divisibility rules for 2 to 12, with a free class board for the teacher. Made by a serving maths teacher. This page is the version to hand to someone in your own department, on paper or as a link. divisibledash.com
What your class does
Numbers fall down the screen. Swipe right if the number is divisible by the current rule, left if it is not. Wrong answers stack up and end the run; correct answers charge a lightning strike that clears the stack, so accuracy buys time. Rules arrive in tiers: 2, 3, 5 and 10, then 9, 4, 6 and 8, then 7.
A run is about ninety seconds. The Daily Challenge is one run a day and is identical for every player in the world, so the class board is a straight race.
What you get out of it
A class leaderboard per tier, by day or across the week. Per-rule accuracy for the whole class and for each student, with the weakest rule named for you. Accuracy by number size, improvement across the range, and how much each student has actually played.
The per-rule accuracy is the part worth having. It tells you what to teach on Monday, not just who won on Friday. Everything on screen exports to CSV.
What it costs you
Nothing. The teacher dashboard, class codes and class boards are free, with no licence, no per-student charge and nothing to cancel.
In the app every student gets the Daily Challenge free every day, plus two practice runs. Founding schools get the full version free for every student until 31 July 2027, unlimited practice and Drill Mode across every class. Otherwise it is one optional GBP 4.99 unlock an individual buys once. No adverts, no subscriptions, no tracking.
Two minutes to a live class
- Create a free teacher account at divisibledash.com/teachers.
- Create a class. You get a six-character code.
- Print the code sheet for the classroom wall. It carries the code and a QR.
- Students tap JOIN CLASS in the app and type the code. That is the whole join: no student accounts, no student email addresses, no consent forms to chase.
What to actually do in the first lesson, and in the week after it, is written up at divisibledash.com/schools/start. It takes five minutes on Monday and three minutes a day after that.
Look before you commit
- A demo class, no account needed. Open divisibledash.com/teachers/?demo=1 for a full dashboard of invented students, clearly labelled, with no students of your own involved.
- A class board in any browser. divisibledash.com/class/ shows a class board from the code alone. No app, no account, safe to project.
- The rules themselves. divisibledash.com/rules/ explains every rule from 2 to 12 with worked examples, free to use in a lesson whether or not you use the game.
- A free classroom poster. divisibledash.com/promote/ has the eleven rules on one printable sheet, plus a how-to-play poster with space to write your class code in by hand.
The three things you will be asked
- "What does it know about the students?" Nothing that identifies them. Students play as a picked name such as SwiftFalcon42, chosen from curated word lists. There is no free-text field anywhere in the game, so there is nowhere for a student to type a name, an email address, an age or anything else. No chat, no adverts, no third-party tracking.
- "Do we have to sign anything?" No. There is no student data to share, so there is nothing to procure and no IT ticket. A roster of first names and last initials is optional and visible to you alone; where one exists your school is the data controller. Privacy policy, Teacher Terms and a schools data-processing agreement are all published at divisibledash.com/privacy, /terms and /dpa.
- "What is the catch?" There is not one for the school. It is built by a maths teacher, the class side is free because a department should not need a purchase order to try something, and the only money in it is one optional unlock an individual can buy once.
divisibledash.com/schools answers all three at more length, for a head of department, and is the page to forward to anyone who has to approve it. The app reaches the App Store and Google Play in October 2026; the class side works now.