Why Working Matters
GCSE Maths mark schemes, published by the exam boards, split marks between method marks, usually labelled M, and accuracy marks, usually labelled A. A three-mark question might give one mark for a correct first step, one for completing the method and one for the right answer. If you write only the final answer and it is wrong, there is nothing for a marker to credit. If you show the method, the same wrong answer can still pick up part marks. Working is effectively insurance on every question you attempt.
One-Mark Questions Versus Longer Questions
Not every question needs the same treatment. A one-mark question is usually marked on the answer alone, so a short calculation or even a mental result written straight down is fine. Once a question carries two or more marks, assume the marks are split across steps and show those steps. A useful habit is to glance at the mark allocation before you start: it tells you roughly how much working the examiner expects. On longer questions, the answer-only approach risks everything on one number.
What Counts as Enough Working
Enough working means the key steps another mathematician would need to reconstruct your thinking: the formula you used, the values you substituted into it, and the intermediate results along the way. For example, if a question needs the area of a circle, write the formula, show the substitution with your numbers in it, then the answer. The examiner should never have to wonder which method you intended. Everything you did in your head that a marker could not reasonably infer belongs on the page.
You Can Have Too Much Working
The flip side is real. Writing out every trivial mental step, like multiplying by one or basic arithmetic a marker can follow instantly, costs time without earning marks, and time is a scarce resource on GCSE papers. The skill is judgement about what a marker needs to see, not transcription of your entire thought process. If you regularly run out of time, trimming unnecessary writing is one of the cheapest fixes available, and our guide on managing time across a GCSE Maths paper covers where the minutes actually go.
Make Your Working Easy to Follow
Working only earns marks if the examiner can read it. Keep steps in order down the page, keep equal signs lined up sensibly, and if you change approach, cross the abandoned attempt out with a single line rather than scribbling over it, because crossed-out work is simply ignored. Students who make easy mistakes despite strong Maths often compound the problem with chaotic layouts, and examiners are instructed to mark what is legible and followable, not to excavate.
Calculator Questions Still Benefit From Method
A common trap is assuming calculator questions need no working because the machine did the arithmetic. The method still needs showing: what you typed and why. If your calculator work goes wrong, and calculator mistakes do cost real marks, written substitutions let the examiner see a correct method behind a mis-keyed result. Writing the substitution also helps you check your work later, which matters because checking answers properly depends on being able to retrace your steps.
If the Final Answer Is Wrong
This is where the habit pays off most clearly. A correct, visible method with a wrong final answer can still earn the method marks, because the marker can see exactly where the process was sound and only the accuracy slipped. A bare wrong answer earns nothing. There is a related question about how many marks you can pick up when you do not finish a question at all, and our guide on whether you can get method marks without finishing a GCSE Maths question covers that case in detail.
Do Not Rely on the Examiner Guessing
Markers mark thousands of scripts against the mark scheme, and they credit what is on the page, not what the student probably meant. If your working is in your head, it does not exist as far as the marks are concerned. The safest rule: show the steps you would want credited if your final answer turned out to be wrong. If exam technique like this is where you leak marks, one-to-one GCSE Maths tutoring can practise it against real past papers until it is automatic.
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