Showing your working sounds like extra effort. It's actually how you find your own mistakes in 10 seconds instead of 10 minutes — and how you keep marks in exams when the final answer is wrong. Here's the protocol, and why most KS3 students do it wrong.

The exam math (why this matters first)

In GCSE maths and most KS3 assessments, method marks are awarded separately from the answer mark. A 5-mark question often breaks down as:

  • 4 marks for correct method steps
  • 1 mark for the correct final answer

If you write only the answer and it's wrong, you get 0 out of 5. If you show your working and only the last step is wrong, you get 4 out of 5.

Same effort. Five times the marks.

The protocol (what counts as "working")

Each step should answer: "What decision did I make, and what did I do?"

Example for Solve 3x + 5 = 14:

3x + 5 = 14            ← start
3x = 14 - 5            ← subtract 5 from both sides
3x = 9                 ← simplify
x = 9 ÷ 3              ← divide both sides by 3
x = 3                  ← final answer

Five lines, four decisions. That's "good working".

What "good working" is not

  • ❌ Rewriting the same equation with no change
  • ❌ Showing 17 steps for a 4-step problem
  • ❌ Writing words instead of equations ("I subtracted five and got nine")
  • ❌ Squeezing everything in one line to save paper

The Show Your Working protocol from Professor Pi

When you submit working to Pi, Pi looks for:

  1. The first step where the error appears — not the symptom, the cause
  2. A common misconception — Pi knows the top 50 KS3 misconceptions per topic
  3. A Socratic question about that step — so you find the error yourself

Example: you wrote 3x + 5 = 14, then 3x = 19. Pi's response: "What did you do to the 5 to get to 19?" You spot it. You don't need to be told.

Why this is faster (after 2 weeks)

In week 1, showing working feels slow. By week 3:

  • You catch arithmetic mistakes mid-problem instead of at the end
  • You stop redoing the same step three times because you can see what you already did
  • You get to "I know why I was wrong" in seconds rather than minutes
  • Your homework correct-rate goes up by ~20% (measured at aitutors.me on early Founders)

The exam version

In a timed exam:

  • Always show working for ≥3-mark questions (the method marks alone are worth it)
  • For 1-mark questions (number-only answers), skip working unless you're unsure
  • Use the line break as a habit — one decision, one line, every time

The trap to avoid

"I can do it in my head" — for 80% of KS3 problems, yes, you can. For the 20% with a careless slip, you'll lose 4 of 5 marks. The student who shows working scores higher across the term even if they're slightly slower per problem.

How to practice

For one week:

  • Every maths question you do, write at least 3 working lines (even simple ones)
  • Submit them to a Socratic AI tutor or check with a teacher
  • Notice how often the error was in line 2, not line 4

After a week, the habit is in. After three weeks, you wonder how you did it the old way.

FAQ

Why do teachers want me to show my working?

Two reasons: method marks in exams (you can lose the answer mark but keep method marks for correct steps) and so they can find your mistake when you're wrong.

How much working should I show?

Every step where you made a decision. You don't need to show "I rewrote the same equation". You do need "I subtracted 5 from both sides".

Does showing working slow me down?

For the first 2 weeks, slightly. Then it speeds you up because you stop making the same mistakes. By Year 9 mocks, clearly faster.

Built into Pi's design at aitutors.me. Updated 20 May 2026.