Download clean, printable lists of the most common mistakes students make — so you can fix them before they cost marks.
Each sheet is aligned to its exam board and built from recurring student errors highlighted in examiner reports and mark schemes.
What you get
A topic-by-topic mistakes list with a “do this instead” fix and a quick self-check.
How to use it
Review before past papers, then use the quick checks to catch errors under timed conditions.
Why it works
Many marks are lost on predictable slips: rounding, sign errors, units, and misreading commands.
Coverage by topic
Preview (up to 5 per topic)
57 total rows in download
| Topic | Common mistake / misconception | Do this instead | Quick check |
|---|---|---|---|
| Assessment style | Giving only a final answer on multi-mark questions (then losing method marks when the answer is wrong). | Show a clear method: key equation/setup, substitution, and steps. You can still earn method marks even if the final answer is incorrect. | Is your method visible and easy to follow? |
| Assessment style | Using the wrong method because the question was skim-read (e.g. nth term instead of sum of a series). | Underline what is asked (term vs total, exact vs estimate, show working). Pick the formula/method that matches the command and the marks. | Is it asking for a term, or a total/sum? |
| Assessment style | Losing marks due to miscopying numbers from the question or your own working. | Rewrite key values clearly and re-check each time you substitute or enter calculator steps. | Did you re-check copied values before calculating? |
| Number | Rounding too early in multi-step problems (accuracy marks lost). | Keep full calculator value; round only at the end (unless told otherwise). | Did you round intermediate steps? |
| Number | Standard form errors: wrong sign of the power or coefficient not in 1–10. | Ensure (1 \le a < 10) and choose the power sign based on magnitude. | Is your coefficient between 1 and 10? |
| Number | Reverse percentages: using the percentage change instead of a multiplier. | Use multipliers (e.g. +15% → ×1.15, then reverse by ÷1.15). | Did you use a multiplier and reverse it correctly? |
| Number | Fraction/ratio of an amount: scaling from the wrong total parts. | Add ratio parts first; find one part; then scale to required parts. | Did you find the total parts first? |
| Number | Bounds/rounding: using the rounded value instead of upper/lower bounds. | Write bounds (e.g. 3.4 to 1 d.p. means (3.35 \le x < 3.45)). | Did you use bounds not the rounded value? |
| Algebra | Expanding brackets with negatives incorrectly. | Distribute carefully; (-(x-3)=-x+3). | Did signs change correctly? |
| Algebra | Factorising: missing a common factor or incorrect factor pair. | Factor out the HCF first; expand back to check. | Does expanding return the original expression? |
| Algebra | Quadratics: missing solutions (forgetting ± when square rooting). | If ((x-a)^2=k), use (x-a=\pm\sqrt{k}). | Did you include both solutions? |
| Algebra | Equations: doing different operations to each side. | Maintain balance: whatever you do to one side, do to the other. | Did you apply the same operation to both sides? |
| Algebra | Algebraic fractions: cancelling terms instead of factors. | Factorise fully; cancel common factors only. | Did you factorise before cancelling? |
| Graphs | Gradient: swapping (Delta y) and (Delta x) or using inconsistent point order. | Use (m=(y_2-y_1)/(x_2-x_1)) with consistent order. | Did you keep point order consistent? |
| Graphs | Misreading coordinates due to ignoring axis scale. | Check increments first; then read (x, y) carefully. | Did you confirm axis increments? |
| Graphs | Finding a gradient from a curve but not drawing a tangent (or using two points on the curve). | Draw a tangent at the required point, choose two clear points on the tangent, then calculate (\Delta y/\Delta x). | Did you use two points on a tangent line? |
| Graphs | Interpreting graphs: confusing intercepts and solutions. | x-intercept where (y=0). Solutions to equations often correspond to intersections. | Which feature does the question ask for? |
| Graphs | Not drawing smooth curves when required (or drawing a curve for a line). | Use the correct shape; plot accurately then draw neatly. | Does the expected graph shape match your drawing? |
| Geometry | Bearings: not using 3 digits or measuring from the wrong direction. | Bearings are clockwise from North and written as 3 digits (e.g. 045°). | Clockwise from North with 3 digits? |
| Geometry | Similarity: using length scale factor for area/volume without squaring/cubing. | Length factor (k), area (k^2), volume (k^3). | Did you use (k^2) or (k^3) when needed? |
| Geometry | Circle theorems/angle facts applied to the wrong angles. | Label points and state the exact rule used; mark angles on the diagram. | Have you marked the angles you’re using? |
| Geometry | Angle facts used without marking/identifying the correct angles. | Mark angles on the diagram and state the rule (alternate/corresponding, etc.). | Have you marked the angles you used? |
| Geometry | Pythagoras applied to non-right triangles. | Use Pythagoras only for right-angled triangles; otherwise use cosine/sine rule if needed. | Is the triangle right-angled? |
| Mensuration | Mixing units (cm vs m) in area/volume questions. | Convert to a single unit before calculating; area uses squared units, volume cubed. | Are all measurements in the same unit? |
| Mensuration | Ratio/scale in areas and volumes: using the same scale factor as for lengths. | If lengths scale by (k), areas scale by (k^2) and volumes scale by (k^3). | Is it a length, area, or volume scale factor? |
| Mensuration | Using diameter instead of radius in circle formulas. | Use (r=d/2); (A=\pi r^2), (C=2\pi r). | Did you halve the diameter? |
| Mensuration | Area/volume units wrong (forgetting cm², cm³). | Area uses squared units; volume uses cubed units. Convert units before calculating. | Are your final units squared/cubed correctly? |
| Trigonometry | Calculator mode wrong (degrees vs radians). | Use degrees mode unless the question explicitly uses radians. | Is your calculator in degrees? |
| Trigonometry | Using the wrong trig ratio because sides aren’t labelled relative to the angle. | Label opposite/adjacent/hypotenuse first (SOHCAHTOA). | Did you label sides relative to the angle? |
| Trigonometry | Sine/cosine rule: pairing wrong angle with opposite side. | Write matching pairs explicitly: each angle with its opposite side. | Are your angle–opposite side pairs correct? |
| Trigonometry | SOHCAHTOA: choosing wrong sides (opposite/adjacent). | Label the triangle relative to the given angle before choosing sin/cos/tan. | Did you label opposite/adjacent/hypotenuse first? |
| Trigonometry | Angles of elevation/depression measured from the wrong line. | Measure from the horizontal; use parallel lines if needed. | Is your reference line horizontal? |
| Probability | OR vs AND: adding when you should multiply (or vice versa). | OR → add (careful with overlap). AND → multiply (if independent). | Is it OR or AND? |
| Probability | Tree diagrams: adding along branches instead of multiplying for a path. | Multiply along a path; add across different paths that satisfy the condition. | Did you multiply for a path and add for alternatives? |
| Probability | Tree diagrams: not checking that probabilities from a node sum to 1 (especially with without-replacement updates). | After each stage, check the branch probabilities from that point add to 1 and update totals correctly for without replacement. | Do branches from each node add to 1? |
| Probability | Without replacement: not updating probabilities after the first selection. | Update totals and counts after each draw; probabilities change without replacement. | Did totals change after the first pick? |
| Statistics | Mean from a table: dividing by the wrong total frequency. | Mean = (\sum fx / \sum f). Ensure (\sum f) is total frequency. | Did you divide by total frequency? |
| Statistics | Histogram: using frequency instead of frequency density when class widths differ. | Height is frequency density; frequency is area = density × class width. | Did you use class width correctly? |
| Statistics | Cumulative frequency: reading quartiles from wrong positions. | Use 25%, 50%, 75% of total frequency, then read across/down carefully. | Did you use 25/50/75% of total frequency? |
| Statistics | Pie charts: mixing up ((\text{part}/\text{total})\times360) or not showing method. | Compute part ÷ total first, then ×360; show the calculation. | Did you divide by total then ×360 (with working)? |
| Statistics | Box plots: using mean instead of median (box plot shows median). | Box plots show median and quartiles, not mean. | Did you use median/quartiles correctly? |
It is a downloadable list of frequent mistakes students make in Edexcel IGCSE Maths (4MA1), paired with a short fix and a “quick check” so you can catch the error under exam time pressure.
It covers common mistakes across the main 4MA1 areas: number, algebra, graphs, geometry & measures, trigonometry, probability and statistics.
No. It is a practical revision resource summarising recurring error patterns and mark-scheme expectations. Always verify methods and command words against your official Edexcel specification and mark schemes.
Before a paper, skim the topics you’re revising. After marking, identify which mistakes you made and practise 5–10 similar questions using the “quick check” prompts to avoid repeating them.