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Math Department

Q.E.D.

Our motto, Q.E.D., stands for the Latin quod erat demonstrandum, “which was to be shown” – the Latin version of the Greek phrase that Euclid and other Greek mathematicians wrote at the end of a proof. Our head of math, Mr Euclid, is named after Euclid of Alexandria, whose Elements (c. 300 BC) was used to teach geometry for more than 2,000 years.

Works in the UK and the US. This version uses US school terms (kindergarten, Grade 3, high school); the UK version uses Reception, Year 4 and secondary school. · UK version of this page

Counting, calculating, proving and puzzling – math for every learner from kindergarten to university, at school or at home, in the UK, the US and anywhere else.

Coming soon

This department is planned and ready to build – it needs funding

We have planned what the Math Department will teach and how it will work. Building it takes funding, so for now you can read our plan below and use the Classfern pages for math that are already live.

Support the Classfern appealCan you help?

Practice tests you can use today

Our Math Department lessons are still to be built, but hundreds of free math questions are ready for you today. There is no sign-up, every answer is marked instantly with an explanation, nothing personal is collected and the tests themselves have no adverts. When the full math lessons arrive, these tests will link straight to them.

What would it take to make math feel like a puzzle again?

Ask a room of adults how they felt about math at school and you will hear everything from love to dread. The Math Department is our attempt to tip that balance. We plan short, varied practice that adapts to the learner, explanations that show why a method works, and plenty of chances to play with numbers rather than merely survive them.

From counting bears to calculus

The plan runs right through education:

  • Kindergarten: counting, comparing and simple shapes, with objects to drag on screen and spoken instructions for children not yet reading.
  • Elementary school (Grades 1–5): number bonds, place value, times tables, fractions and measures, building on the times table test and practice tests already here.
  • Middle and high school: algebra, geometry, ratio, statistics and probability, then trigonometry and calculus for older students.
  • University and adults: refreshers for everyday math, statistics for study and work, and proof-writing for anyone heading into a math degree.

Questions that never run out

Rather than fixed worksheets that run out, learners will be able to ask for “ten more like this” as often as they want. Answers will be Marked by Classfern straight away, with partial credit where working is shown in steps. Longer problems and investigations will be Partly marked or Judged by a teacher or parent (rubric), so everyone knows exactly how a task was checked. No sign-up is needed and nothing personal is collected.

Tools for the board and the kitchen table

Alongside practice, the department will hold interactive teaching tools: a fraction wall, a number line that zooms from whole numbers down to decimals, a geometry board for constructions and a graph plotter that draws as you type. They are designed for a projector in a classroom, and equally for a parent sitting beside a child at home.

Mr Euclid and the art of being sure

Euclid did not simply collect facts about triangles; he showed how each one follows from a handful of starting points. That is why Q.E.D. suits our math teacher so well. His proofs close with the Greek version of the phrase, a small flourish that says “and there it is”. We want learners to feel that same click when a stubborn problem finally gives way.

Meanwhile, in the Music Department

Our flagship Music Department is where to look for a preview of the math to come. Learners there climb through theory levels, play along with tunes at their own level and pick up note reading one small win at a time. Expect that same feeling of steady progress when the Math Department opens.

What happens next

Every piece of this is planned and ready to build. We will start once the department is funded – and if you teach math and have a favorite topic that students always find tricky, we would love to hear about it.

Support the Classfern appeal

Every Classfern department is ready on paper, but each one needs funding before we can build it. A gift of any amount helps build Classfern – including new departments like this one – and keeps the free tools free for teachers, families and learners.

Support the Classfern appeal →

Classfern is a small business, not a charity. The support page explains how gifts are used.

Can you help? Teachers and subject experts – tell us

If you teach math or know it well, we would love your ideas, examples and corrections for this department.

Tell us how you can help

All Classfern departments · Visit the Music Department, our flagship