What to Do in the Moment
If your calculator dies, freezes or starts behaving strangely during a calculator paper, the first step is simple: raise your hand and tell an invigilator. Invigilators exist to run the exam and deal with exactly this kind of problem, and there is nothing embarrassing about asking. Silently struggling with a broken calculator, or trying to hide the problem, is the one response that genuinely costs you.
Beyond telling an invigilator, the sensible priorities are calm and flexibility. Take a breath: a broken calculator is a solvable problem, not a ruined exam. And whatever the fix turns out to be, you do not need to sit frozen while it happens. Which brings us to the next point.
Keep Working While the Issue Is Addressed
While you wait for help, keep going. Many questions on a calculator paper are still partly answerable without a device: setting up equations, drawing diagrams, writing method steps, and even completing short calculations by hand where the numbers are manageable. That working is not wasted either, because visible method can earn credit on its own, as our guide on method marks without finishing a question explains.
What exactly happens next, such as whether a spare calculator is offered and how quickly, depends on your exam centre's arrangements, and we will not pretend there is a universal rule. That uncertainty is the strongest argument for the step below: ask your teacher in advance what the school can do in that situation, so you are never relying on guesswork on the day.
Check Your Equipment Before the Exam
Prevention is where this problem actually gets solved. JCQ's information for candidates is explicit about it: if you use a calculator, make sure it works properly and check that the batteries are working properly. That is not background advice, it is a checklist item, and it belongs in the days before the exam, not five minutes before you leave the house.
- Test the calculator on real calculations a day or two before each calculator paper, not just by turning it on
- Put in fresh batteries before the exam if the display looks faint or the calculator has been unused for a while
- Do not bring operating instructions or a prepared program into the exam room: JCQ's guidance does not allow it
- Pack a spare calculator or fresh batteries if you can, as a belt-and-braces backup
Our guide on what to do the night before a GCSE Maths exam includes a full evening-before checklist where equipment checks sit alongside the rest of your preparation.
Why Familiarity With Your Own Calculator Matters
A calculator you have practised with is worth more than a technically better one you have not. Under exam pressure, you need to reach functions without thinking: fractions, powers, brackets, percentages, and the mode settings for degrees versus radians. A different model, however good, adds thinking you do not need on the day.
Familiarity also helps you notice when something is wrong. A student who knows their calculator's normal behaviour spots a failing display or a slow response early, which is another reason the pre-exam check should be with the calculator itself rather than a quick glance. Our article on which calculator to use for GCSE Maths covers what a suitable calculator needs to do, and why practising with your own one matters.
Avoiding Panic
Most of the damage from a calculator failure comes not from the lost minutes but from the panic around them. A student who panics starts rushing, misreads and abandons working that was earning marks. Remember the shape of the situation: the calculator is a tool for part of one paper, the exam is more than one paper, and the questions that need it most can still be partially worked by hand in the meantime. Whatever happens, an attempted answer with visible method beats a blank box.
Sensible Preparation Before Exam Day
To pull this together into a pre-exam routine: test the calculator with real calculations a few days out, fit fresh batteries if there is any doubt, pack a backup if you can, confirm with your teacher what the school's arrangements would be if a calculator failed, and practise your calculator skills on past papers so the device is second nature. None of it takes long, and together it makes the scenario almost impossible.
If equipment is one of several exam-day worries, our one-to-one GCSE Maths tutoring builds the Maths and the exam technique behind it, and you can get matched with a tutor to start.