Free class boards for your maths department.
Divisible Dash is an arcade game that drills the divisibility rules for 2 to 12 until they are automatic. Students play a short run, the class board fills up, and you see exactly which rule the room is getting wrong. It is made by a serving maths teacher, it costs your school nothing, and it holds no personal data about your students.
- Free for the school, permanently
- No student accounts, no student emails
- Set up in a free period
Or set it up yourself in two minutes at divisibledash.com/teachers. There is nothing to pay and nothing to cancel.
The data question, answered before you ask it
This is the first thing a head of department wants to know, so it is the first thing on the page. The short version: your students never type a personal detail into this game, because there is nowhere in it to type one.
Never collected, by design
- No student names. Every player is a picked name such as SwiftFalcon42, assembled from curated word lists. There is no free-text field anywhere in the game.
- No student email addresses. A student has no account to create and no password to forget. The class code is the entire join.
- No age, date of birth, school year or location. None of it is asked for and none of it is inferred.
- No chat, no messaging, no user-generated content. There is no route by which one student can send another student anything.
- No adverts, no advertising identifiers, no third-party tracking or analytics SDKs.
What is actually stored
- Scores and per-rule accuracy against a picked name, so the class board and the insights can exist.
- An anonymous account identifier generated on the device. It is not linked to a person and it never leaves the account.
- Which class a player joined, so their score lands on the right board. You can change the code or archive the class at any time.
- Your teacher account: your school email address and your classes. If you sign in with Google, the name and picture on that account are stored with it and not used. Yours, not your students'.
- A roster, only if you type one. First name and last initial, so you can match a picked name to a student. Visible to you alone, never on a projected board, and deletable in one click.
The paperwork exists and is linked, not promised. Privacy policy, Teacher Terms and a schools data-processing agreement your data protection lead can read today. Where a roster exists, your school is the data controller and the terms say so in plain words.
What it actually is
What students do
A number falls down the screen. The rule at the top says "divisible by 6". Swipe right if it is, 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 you time.
Runs are short. A student who has three minutes has time for one.
What you see
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.
Everything on screen exports to CSV, so the department keeps its own record.
Why divisibility
It is the fluency that everything downstream assumes. Simplifying fractions, factorising, HCF and LCM, prime factorisation and ratio all cost working memory when divisibility is not automatic.
It is also small enough to make automatic. Eleven rules, drilled at speed, is a realistic term's worth of gain.
The eleven rules, and the order they arrive in
Three tiers, so a Year 7 class and a Year 10 class are not playing the same thing.
All eleven are explained with worked examples on the divisibility rules page, which is free to use in a lesson whether or not your department ever installs the game.
What a rollout actually looks like
There is no procurement, no purchase order, no IT ticket and no student data to hand over. This is the entire process.
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Ten minutes, once
You create a free teacher account
At divisibledash.com/teachers, with your school email address or your school Google account. Create a class and you get a six-character code. Print the code sheet for the wall.
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One lesson
Your class joins with the code
Students tap JOIN CLASS and type the six characters. That is the whole join. No accounts to create, no emails to collect, no consent forms to chase, no logins to reset in week three.
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Five minutes a day
The class plays the Daily Challenge
One run a day, the same numbers for every player in the world, so the class board is a straight race and nobody can grind an advantage. It works as a starter, as form time, or as homework.
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Whenever you look
You read the board and the accuracy
Project the board on the whiteboard, or open the insights and find out that half the room fails the 8 rule because they are checking two digits instead of three. Then teach that.
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If it works
You tell the rest of the department
Each teacher makes their own classes. There is nothing central to configure and no seat count to manage, so a second class costs exactly as much as the first. For the department meeting there are six slides to project.
Weakest rule this week
÷8, 55% correct from 212 answers
- 94% correct for divisible by 2
- 83% correct for divisible by 3
- 76% correct for divisible by 4
- 92% correct for divisible by 5
- 71% correct for divisible by 6
- 62% correct for divisible by 7
- 55% correct for divisible by 8
- 80% correct for divisible by 9
- 91% correct for divisible by 10
- 64% correct for divisible by 11
- 73% correct for divisible by 12
What it costs
Nothing for the school. There is no school licence, no site fee, no per-student charge and no invoice, and that is a deliberate decision rather than an introductory offer.
| What | Cost | Notes |
|---|---|---|
| Teacher account and dashboard | Free | Unlimited classes, unlimited students, CSV export. |
| Class codes and class boards | Free | Including the browser board at divisibledash.com/class, which needs no app and no account. |
| The Daily Challenge, for every student | Free | Every day, forever, with the same numbers worldwide, plus two practice runs a day. No account and no payment. |
| The divisibility rules pages and posters | Free | Use them in lessons whether or not you use the game. |
| The full version, for every student you teach | Free for founding schools | Unlimited practice and Drill Mode across every class, free until 31 July 2027 for schools joining this year. |
Free for founding schools and their students until 31 July 2027. Unlimited practice and Drill Mode for every student in the school's classes, at no cost, for schools that join this school year.
Either way, the Daily Challenge is free every day for every student, plus two practice runs a day. That is what a class playing the daily together actually uses.
Optional
Unlimited practice and Drill Mode. One unlock in the app, for anyone who wants more than the Daily Challenge and two practice runs a day. Bought once by an individual, never by a school, and never a subscription. A class playing the daily together does not need it.
There are no adverts anywhere in the game, and there is nothing a player can be charged for repeatedly.
Look at it before you commit to anything
All four of these work right now, in a browser, with no account and no students of yours involved.
A full demo class
The complete dashboard, filled with invented students and clearly labelled as a demo. Boards, per-rule accuracy, the lot.
divisibledash.com/teachers/?demo=1
A class board in any browser
A code alone shows a class board. No app, no account, safe to put on a projector in front of a room.
The rules, with worked examples
Every rule from 2 to 12 explained properly, including why each one works, which is the part students actually remember.
A printable rules poster
The eleven rules on one sheet for the classroom wall. Free, and useful on its own.
Cups between schools are coming, scored on the Daily Challenge. See a demo cup, with invented schools.
Who made it
Divisible Dash is built by Peter Browne, a serving secondary maths teacher. It exists because the divisibility rules are taught once, tested once and then quietly assumed for the next five years, and because nothing on the market drilled them in a way a class would choose to do twice.
That also explains the decisions on this page. There is no school licence because a department should not need a purchase order to try something. There is no student data because collecting it would mean somebody has to look after it. There are no adverts because the room is full of students.
If something about it does not work for your department, saying so gets a reply from the person who wrote the code.
Send me one email and I will set your class up
Tell me your school, the year group and roughly how many students, and I will create the class, send you the code sheet ready to print, and stay on hand for the first week. It takes me ten minutes and it saves you working out the dashboard on a Sunday night.
No call to book, no demo to sit through, no sales follow-up. One reply from a maths teacher who wants to know whether it works in your room.
The teacher dashboard, class codes and the browser class boards work today. The app itself arrives on the App Store and Google Play in October 2026, so a department that sets a class up now is ready on day one rather than starting from scratch in October.