Cambridge marks Mathematics in two currencies: accuracy marks for right answers, and method marks for right thinking. Candidates who work in their heads spend only the first currency, and when an answer slips, they lose everything at once. The single largest technique gain in 0580 is mechanical: write the method down, every time, because a wrong answer above visible correct method still collects.
This guide is for candidates sitting IGCSE Mathematics (0580) in the October/November 2026 series, and for the parents and teachers supporting them. It does not reteach the syllabus. It covers the habits that turn the mathematics a candidate already knows into marks on the page, and a plan for the weeks that remain.
The technique rules that bank marks
| Rule | Why it pays |
|---|---|
| Show every step, one operation per line | Method marks survive arithmetic slips |
| Keep full calculator values until the final line | Early rounding kills accuracy marks legally earned |
| Give answers to three significant figures unless told otherwise | The default accuracy rule of the syllabus |
| Include units where the question has them | A correct 42 without its cm² is a lost mark |
| Attempt every part; later parts often stand alone | Part (b) frequently does not need part (a) |
What "show your working" really means
Showing working is not about length. It means an examiner can follow the route from the question to the answer without guessing. Write the formula you are using, substitute the numbers into it, then simplify. If you use your calculator for a long expression, write the expression you typed in before the result. That one line is often the method mark.
Rounding without losing marks
The most common accuracy loss is premature rounding. A candidate finds an intermediate length of 7.2111..., writes 7.2, and carries 7.2 into the next calculation. The final answer then drifts away from the accepted value. The fix is simple: write the intermediate value to four or five figures on the page, keep the full value in the calculator memory, and round only once, at the end. Angles in degrees are conventionally given to one decimal place; check the question for any specific instruction.
Where the November papers concentrate
The anchors repeat series after series: percentages and ratio in context, algebraic manipulation and solving, mensuration of the standard solids, right-angled trigonometry and bearings, probability including tree diagrams, and statistics with cumulative frequency. The transformation and vectors questions separate grades at the top of the Extended paper, and reward candidates who state transformations fully: type, plus centre, angle, scale factor or vector, every component named.
| Anchor topic | Where marks usually leak | The fix |
|---|---|---|
| Percentages and ratio | Using the wrong original value in percentage change | Write "original = ..." before calculating |
| Algebra | Sign errors when expanding or rearranging | One operation per line; check by substitution |
| Mensuration | Mixing radius and diameter; missing units | Label r and d on the diagram first |
| Trigonometry and bearings | Calculator in the wrong angle mode; bearings not measured clockwise from north | Check degree mode at the start of the paper; draw a north line at every point |
| Probability | Adding where branches should be multiplied | Multiply along branches, add between outcomes |
| Cumulative frequency | Plotting at midpoints instead of upper class boundaries | Plot at the upper end of each class |
| Transformations | Incomplete descriptions | Name the type, then every detail it needs |
Practice example (written for practice, not a Cambridge item)
Describe fully the single transformation that maps triangle A onto triangle B, where B is A turned a quarter turn anticlockwise about the point (1, 2).
A full answer reads: rotation, 90° anticlockwise, centre (1, 2). "Rotation" alone usually earns one mark at most. Each missing detail is a missing mark, which is why the habit of naming every component pays at the top end.
Checking is a technique of its own
Checking is a technique of its own: substitute solutions back into equations, test that a probability lands between zero and one, and ask whether a length of 4,000 metres for a classroom makes sense. One reread of the question before moving on catches the "give your answer as a percentage" instructions that quietly cost a mark each.
- Estimate first. Before pressing the calculator, round the numbers and get a rough answer. If the calculator disagrees wildly, look for a keying error.
- Read the last line of the question twice. The form of the answer (fraction, standard form, nearest whole number, percentage) is often specified there.
- Reverse the operation. If you solved for x, substitute it back. If you found a percentage increase, apply it to the original and see if you reach the new value.
- Look at the marks. A three-mark part usually needs more than one line of working. A one-mark part rarely needs a page.
Managing time on the paper
Candidates often spend too long on a stubborn early question and rush the high-value questions at the end. A useful rule: if a part has stalled for a few minutes, leave a clear gap, move on, and come back. Because later parts often stand alone, a candidate who skips part (a) can still collect part (b) and (c). Keep a few minutes at the end for a sweep through any blanks; a reasonable attempt with working can earn method marks where a blank earns none.
Sister guides and the next step
The sister guides cover the sciences' November technique: Physics 0625, Chemistry 0620 and Biology 0610. Candidates eyeing the next step can preview where 0580's topics deepen with the A Level Mathematics (9709) revision pack.
The final month
One past paper per week under time, marked against the scheme, with a rework session for every question dropped. In the last fortnight, alternate papers with topic drills on your two weakest anchors. Marks in 0580 are not found on exam day; they are banked in the four weeks before it, one written method line at a time.
| Session | What to do |
|---|---|
| Paper day | Full past paper under timed conditions, no notes |
| Marking day | Mark strictly with the scheme; note every lost method and accuracy mark |
| Rework day | Redo each dropped question from a blank page without looking at the answer |
| Drill days | Short topic sets on the two weakest anchors from the table above |
Parents can help without knowing the mathematics: protect the timed paper sessions, ask to see the marked script, and check that the rework actually happens. The rework is where improvement lives.
Frequently asked questions
Do I lose all the marks if my final answer is wrong?
Not if your method is written down. Method marks are awarded for correct working, so a slip in the last line usually costs only the accuracy mark. That is the main reason to show every step.
How many significant figures should I give?
Three significant figures unless the question says otherwise, with angles in degrees usually to one decimal place. Exact answers should be given exactly if they are short.
Should I attempt a question I cannot fully solve?
Yes. Write the relevant formula and any correct first step. Partial working can earn method marks, and later parts of the question may not depend on the part you are stuck on.
How many past papers should I do before November?
Quality beats quantity. One timed paper a week, properly marked and reworked, does more than several papers done quickly and never reviewed.
IGCSE Revision Materials
Notes and topical questions for the core IGCSE subjects, timed to the Oct/Nov series.
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