{"id":32839,"date":"2026-02-24T13:30:49","date_gmt":"2026-02-24T06:30:49","guid":{"rendered":"https:\/\/times.edu.vn\/?p=32839"},"modified":"2026-03-11T17:44:17","modified_gmt":"2026-03-11T10:44:17","slug":"top-common-igcse-maths-mistakes-to-avoid","status":"publish","type":"post","link":"https:\/\/times.edu.vn\/en\/igcse\/top-common-igcse-maths-mistakes-to-avoid\/","title":{"rendered":"Top Common IGCSE Maths Mistakes to Avoid"},"content":{"rendered":"<p>IGCSE Maths mistakes most often come from misreading questions, losing accuracy through early rounding and incorrect significant figures, forgetting units of measurement, and making algebraic manipulation slip-ups (especially negative signs and brackets). These common errors reduce both method marks (unclear working) and accuracy marks (wrong final value), even when the core topic is understood. Strong exam technique\u2014showing clear steps, controlling calculator errors (mode, brackets, re-entry), and double checking units and rounding\u2014protects marks consistently. The most reliable way to improve is to track your recurring silly mistakes using past papers and apply a simple checking routine on every question.<\/p>\n<h2><strong>Common IGCSE Maths mistakes that cost students marks<\/strong><\/h2>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-32840 size-full\" src=\"https:\/\/times.edu.vn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_aurykiaurykiaury.webp\" alt=\"Top Common IGCSE Maths Mistakes to Avoid\" height=\"545\" srcset=\"https:\/\/times.edu.vn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_aurykiaurykiaury.webp 1000w, https:\/\/times.edu.vn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_aurykiaurykiaury-300x164.webp 300w, https:\/\/times.edu.vn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_aurykiaurykiaury-768x419.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/> IGCSE Maths is not \u201chard\u201d in the way many students fear. It is unforgiving in a specific way: a small set of repeatable <i>IGCSE Maths mistakes<\/i> can erase a large number of marks, even when the student understands the topic. Based on our years of practical tutoring at Times Edu, the majority of lost marks come from <i>common errors<\/i> in interpretation, precision, and presentation rather than weak content knowledge. The pattern is consistent across:<\/p>\n<ul>\n<li><strong>Cambridge<\/strong> (CAIE) <sup><a href=\"#tooltip-ref-1\" class=\"tooltip-link\" data-tooltip=\"https:\/\/www.cambridgeinternational.org\/about-us\/\">[1]<\/a><\/sup><\/li>\n<li><strong>Edexcel<\/strong> <sup><a href=\"#tooltip-ref-2\" class=\"tooltip-link\" data-tooltip=\"https:\/\/qualifications.pearson.com\/en\/about-us\/qualification-brands\/edexcel.html\">[2]<\/a><\/sup><\/li>\n<li><strong>OxfordAQA<\/strong> <sup><a href=\"#tooltip-ref-3\" class=\"tooltip-link\" data-tooltip=\"https:\/\/www.oxfordaqa.com\/\">[3]<\/a><\/sup><\/li>\n<\/ul>\n<h3><strong>Why these mistakes matter more than students expect<\/strong><\/h3>\n<p>Most IGCSE mark schemes reward process. High-scoring students protect <i>method marks<\/i> by writing clear steps, then secure <i>accuracy marks<\/i> by controlling rounding, units, and calculator use. A critical detail most students overlook in the 2026 exam cycle is that exam papers increasingly test multi-step reasoning inside familiar topics. That means one careless misread or one line of missing working can collapse several marks at once.<\/p>\n<h3><strong>The \u201cmark-leak\u201d model we use at Times Edu<\/strong><\/h3>\n<p>From our direct experience with international school curricula, nearly all mark loss falls into four \u201cleaks\u201d:<\/p>\n<ul>\n<li>Misread the task (keywords, diagrams, constraints).<\/li>\n<li>Break precision (significant figures, rounding, units of measurement).<\/li>\n<li>Break algebra (algebraic manipulation under time pressure).<\/li>\n<li>Break exam technique (presentation, structure, double checking, calculator errors).<\/li>\n<\/ul>\n<p>If you plug the leaks, your grade moves faster than by learning new topics alone.<\/p>\n<h3><strong>A comparison table of high-frequency mistakes<\/strong><\/h3>\n<div class=\"table-container\">\n<div class=\"table-container\">\n<div class=\"table-container\">\n<table>\n<tbody>\n<tr>\n<th><strong>IGCSE Maths mistakes (high frequency)<\/strong><\/th>\n<th><strong>Typical cause<\/strong><\/th>\n<th><strong>What it costs<\/strong><\/th>\n<th><strong>Fix that works under exam pressure<\/strong><\/th>\n<\/tr>\n<tr>\n<td>Misreading \u201cnot\u201d, \u201cat least\u201d, \u201cexact\u201d, \u201cestimate\u201d<\/td>\n<td>Rushing the first read<\/td>\n<td>Whole question<\/td>\n<td>Two-pass reading + highlight command words<\/td>\n<\/tr>\n<tr>\n<td>Missing units of measurement (cm\u00b2, m\/s, km\/h)<\/td>\n<td>Focus on number only<\/td>\n<td>1\u20132 marks<\/td>\n<td>Unit scan before final line<\/td>\n<\/tr>\n<tr>\n<td>Rounding too early<\/td>\n<td>\u201cLooks neat\u201d instinct<\/td>\n<td>Accuracy marks<\/td>\n<td>Keep full precision until the end<\/td>\n<\/tr>\n<tr>\n<td>Wrong mode \/ settings<\/td>\n<td>Calculator habit<\/td>\n<td>Multiple marks<\/td>\n<td>Mode check routine (degrees\/radians, decimal)<\/td>\n<\/tr>\n<tr>\n<td>Sign errors in algebraic manipulation<\/td>\n<td>Speed + weak bracket discipline<\/td>\n<td>Method marks + accuracy<\/td>\n<td>\u201cBracket first\u201d rewrite strategy<\/td>\n<\/tr>\n<tr>\n<td>Not showing working<\/td>\n<td>Belief that final answer is enough<\/td>\n<td>Method marks<\/td>\n<td>Write minimal-but-complete steps<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<p><strong class=\"read-more-post\">&gt;&gt;&gt; Read more:<\/strong> <a class=\"xem-them-link\" href=\"https:\/\/times.edu.vn\/en\/igcse\/igcse-additional-maths-time-management\/\">IGCSE Additional Maths Time Management<\/a> 2026: How to Finish the Exam with Confidence<\/p>\n<h2><strong>Rounding errors and significant figures pitfalls<\/strong><\/h2>\n<p>Rounding is a silent grade-killer because it feels \u201creasonable\u201d while producing a final answer outside the accepted range. Examiners often allow a tolerance, but that tolerance does not protect you if you rounded too early and drifted far from the true value.<\/p>\n<h3><strong>The misconception that causes most rounding mistakes<\/strong><\/h3>\n<p>Many students think: \u201cIf the question asks for 3 significant figures, I should round every step to 3 s.f.\u201d That is a classic <i>common error<\/i>. The pedagogical approach we recommend for high-achievers is to separate <strong>calculation accuracy<\/strong> from <strong>presentation accuracy<\/strong>. Calculate with full precision, then round once at the end.<\/p>\n<h3><strong>How mark schemes treat rounding<\/strong><\/h3>\n<ul>\n<li><i>Accuracy marks<\/i> usually require the correct final value to the requested rounding.<\/li>\n<li>If intermediate rounding changes your final answer, you lose the accuracy mark even if your method was correct.<\/li>\n<li>You may still earn <i>method marks<\/i> if your steps show the right structure, but the total is capped.<\/li>\n<\/ul>\n<h3><strong>A practical rounding protocol (works across boards)<\/strong><\/h3>\n<p>Use this routine on any multi-step numeric question:<\/p>\n<ul>\n<li>Keep at least 4\u20135 significant figures (or full calculator value) in intermediate steps.<\/li>\n<li>Store values in calculator memory if needed.<\/li>\n<li>Round only the final result to the requested significant figures or decimal places.<\/li>\n<li>If the paper expects an exact answer (fraction, surd, multiple of \u03c0), do not round at all.<\/li>\n<\/ul>\n<h3><strong>Significant figures: where students lose \u201ceasy marks\u201d<\/strong><\/h3>\n<p>Most students lose marks in these situations:<\/p>\n<ul>\n<li>Confusing decimal places with significant figures.<\/li>\n<li>Rounding a number like 0.004560 to 3 s.f. incorrectly.<\/li>\n<li>Rounding negative numbers incorrectly because they focus on digits and forget direction.<\/li>\n<\/ul>\n<h3><strong>Quick reference table: precision decisions<\/strong><\/h3>\n<div class=\"table-container\">\n<div class=\"table-container\">\n<div class=\"table-container\">\n<table>\n<tbody>\n<tr>\n<td><strong>Question wording<\/strong><\/td>\n<td><strong>Expected format<\/strong><\/td>\n<td><strong>What to do<\/strong><\/td>\n<td><strong>Common errors<\/strong><\/td>\n<\/tr>\n<tr>\n<td>\u201cGive your answer to 3 s.f.\u201d<\/td>\n<td>Rounded decimal<\/td>\n<td>Round at the end<\/td>\n<td>Rounding intermediate steps<\/td>\n<\/tr>\n<tr>\n<td>\u201cCorrect to 2 decimal places\u201d<\/td>\n<td>Rounded to dp<\/td>\n<td>Round at the end<\/td>\n<td>Mixing dp and s.f.<\/td>\n<\/tr>\n<tr>\n<td>\u201cExact value\u201d<\/td>\n<td>Fraction\/surd\/\u03c0 form<\/td>\n<td>Keep exact<\/td>\n<td>Writing a decimal approximation<\/td>\n<\/tr>\n<tr>\n<td>\u201cEstimate\u201d<\/td>\n<td>Sensible approximation<\/td>\n<td>Round early with intention<\/td>\n<td>Over-precision that wastes time<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<h3><strong>Units of measurement interact with rounding<\/strong><\/h3>\n<p>Units are not decoration. They communicate the scale and sometimes the dimension, and missing them can lose marks even with the correct number. Common traps include:<\/p>\n<ul>\n<li>Area answers missing squared units (cm\u00b2, m\u00b2).<\/li>\n<li>Volume answers missing cubed units (cm\u00b3, m\u00b3).<\/li>\n<li>Speed answers missing \u201cper time\u201d units (km\/h, m\/s).<\/li>\n<\/ul>\n<p>When units matter, they are often tied to <i>accuracy marks<\/i> because the examiner cannot confirm the meaning of your number without the unit.<\/p>\n<p><strong class=\"read-more-post\">&gt;&gt;&gt; Read more:<\/strong> <a class=\"xem-them-link\" href=\"https:\/\/times.edu.vn\/en\/igcse\/igcse-additional-maths-mock-improvement-plan\/\">IGCSE Additional Maths Mock Improvement Plan<\/a> 2026: A Step-by-Step Guide to Raise Your Score<\/p>\n<h2><strong>Misinterpreting key terms in probability questions<\/strong><\/h2>\n<p>Probability questions look short, but they are language-heavy. Many <i>IGCSE Maths mistakes<\/i> here come from misreading \u201cat least\u201d, \u201cexactly\u201d, \u201cboth\u201d, \u201ceither\u201d, \u201cindependent\u201d, and \u201cwithout replacement\u201d. Based on our years of practical tutoring at Times Edu, students who struggle in probability usually have the math tools but not the reading discipline.<\/p>\n<h3><strong>The keywords that cause the biggest confusion<\/strong><\/h3>\n<p>Students consistently confuse these pairs:<\/p>\n<ul>\n<li>\u201cAt least one\u201d vs \u201cexactly one\u201d<\/li>\n<li>\u201cEither A or B\u201d (exclusive vs inclusive depending on context)<\/li>\n<li>\u201cIndependent\u201d vs \u201cmutually exclusive\u201d<\/li>\n<li>\u201cWith replacement\u201d vs \u201cwithout replacement\u201d<\/li>\n<\/ul>\n<h3><strong>\u201cMore than\u201d and \u201cless than\u201d: a recurring word-problem trap<\/strong><\/h3>\n<p>A very common error is treating \u201cmore than\u201d as \u201cgreater than or equal to\u201d. Another is reversing \u201cless than\u201d in inequality form. Train yourself to translate language into symbols slowly:<\/p>\n<ul>\n<li>\u201cMore than 5\u201d \u2192 x&gt;5x&gt;5<\/li>\n<li>\u201cAt least 5\u201d \u2192 x\u22655x\u22655<\/li>\n<li>\u201cNo more than 5\u201d \u2192 x\u22645x\u22645<\/li>\n<\/ul>\n<h3><strong>Probability diagrams: choosing the right tool<\/strong><\/h3>\n<p>From our direct experience with international school curricula, students pick the wrong representation under time pressure. The result is not just a wrong answer, but a loss of <i>method marks<\/i> because the structure does not match the scenario. Use this decision rule:<\/p>\n<ul>\n<li><strong>Two-stage events<\/strong> \u2192 Tree diagram.<\/li>\n<li><strong>Venn relationships<\/strong> \u2192 Venn diagram with set notation.<\/li>\n<li><strong>Repeated trials with counts<\/strong> \u2192 Tables, lists, or binomial reasoning (if in syllabus).<\/li>\n<li><strong>Conditional probability<\/strong> \u2192 Explicitly write \u201cgiven\u201d and update the sample space.<\/li>\n<\/ul>\n<h3><strong>How to protect method marks in probability<\/strong><\/h3>\n<p>Even when the final probability is wrong, you can still earn method marks if your setup is correct. You protect marks by writing:<\/p>\n<ul>\n<li>The sample space or total outcomes.<\/li>\n<li>The event definition in words.<\/li>\n<li>The probability expression before you compute.<\/li>\n<\/ul>\n<p>This is exam technique, not extra work.<\/p>\n<h3><strong>Double checking probability answers quickly<\/strong><\/h3>\n<p>Use two fast checks:<\/p>\n<ul>\n<li>Your final probability must be between 0 and 1.<\/li>\n<li>If events are \u201cwithout replacement\u201d, the second probability should change.<\/li>\n<\/ul>\n<p>These checks catch a large share of silly mistakes without costing much time.<\/p>\n<p><strong class=\"read-more-post\">&gt;&gt;&gt; Read more:<\/strong> <a class=\"xem-them-link\" href=\"https:\/\/times.edu.vn\/en\/igcse\/igcse-additional-maths-past-paper-strategy\/\">IGCSE Additional Maths Past Paper Strategy<\/a>: Smart Ways to Practice for Better Results in 2026<\/p>\n<h2><strong>Algebraic errors to avoid in exam pressure<\/strong><\/h2>\n<p>Algebra is where students lose marks through speed. Most algebra topics are not conceptually hard at IGCSE level, but algebraic manipulation is fragile when you rush.<\/p>\n<h3><strong>The three \u201csignature\u201d algebra mistakes we see most<\/strong><\/h3>\n<ol>\n<li><strong>Sign errors with brackets<\/strong> A classic: \u2212(2x\u221210)\u2212(2x\u221210) becoming \u22122x\u221210\u22122x\u221210 instead of \u22122x+10\u22122x+10.<\/li>\n<li><strong>Incorrect expanding and factorizing<\/strong> Students expand (x+3)2(x+3)2 as x2+9&#215;2+9 and forget the middle term.<\/li>\n<li><strong>Index (power) rules misapplied<\/strong> Students write am+an=am+nam+an=am+n, which is false.<\/li>\n<\/ol>\n<p>These are <i>common errors<\/i> that are easy to diagnose and fix with targeted practice.<\/p>\n<h3><strong>A \u201crewrite-first\u201d method to reduce sign errors<\/strong><\/h3>\n<p>The pedagogical approach we recommend for high-achievers is to rewrite expressions before manipulation:<\/p>\n<ul>\n<li>Replace subtraction with addition of a negative where possible.<\/li>\n<li>Put brackets around negative terms explicitly.<\/li>\n<li>Write one line that only changes structure, not values.<\/li>\n<\/ul>\n<p>Example approach:<\/p>\n<ul>\n<li>Start: \u2212(2x\u221210)\u2212(2x\u221210)<\/li>\n<li>Rewrite: \u22121(2x\u221210)\u22121(2x\u221210)<\/li>\n<li>Expand carefully: \u22122x+10\u22122x+10<\/li>\n<\/ul>\n<p>This takes seconds and prevents repeated accuracy loss.<\/p>\n<h3><strong>Algebra and marks: Why presentation affects your score<\/strong><\/h3>\n<p>Algebra questions often allocate marks across stages. If you skip a stage, you may still get the final answer but lose method marks because the examiner cannot validate your reasoning. A clean layout helps the examiner award method marks even if your arithmetic slips later.<\/p>\n<h3><strong>Targeted drills that reduce silly mistakes<\/strong><\/h3>\n<p>Do not \u201cdo more algebra questions\u201d blindly. Do drills that attack the failure mode:<\/p>\n<ul>\n<li>10-question micro-set: Expanding brackets with negatives.<\/li>\n<li>10-question micro-set: Factorizing with a common factor and sign.<\/li>\n<li>10-question micro-set: Solving linear equations with fractions.<\/li>\n<li>Error log: Write the wrong line you produced and the corrected line.<\/li>\n<\/ul>\n<p>This builds reliability, which is what exams reward.<\/p>\n<p><strong class=\"read-more-post\">&gt;&gt;&gt; Read more:<\/strong> <a class=\"xem-them-link\" href=\"https:\/\/times.edu.vn\/en\/igcse\/igcse-additional-maths-explain-questions\/\">IGCSE Additional Maths Explain Questions<\/a>: How to Write Clear, High-Scoring Answers in 2026<\/p>\n<h2><strong>Failing to show full working out for high mark questions<\/strong><\/h2>\n<p>Not showing working is one of the most expensive <i>IGCSE Maths mistakes<\/i> because it destroys your ability to earn method marks. Even if your mental math is strong, exams do not mark your thoughts.<\/p>\n<h3><strong>Method marks vs accuracy marks: the rule students need to internalize<\/strong><\/h3>\n<ul>\n<li><strong>Method marks<\/strong> reward correct mathematical approach and steps.<\/li>\n<li><strong>Accuracy marks<\/strong> reward the correct final value (often dependent on earlier steps).<\/li>\n<\/ul>\n<p>If you do not show your method, you frequently cap your score at the final accuracy mark only. If the final is wrong, you may receive zero even though your thinking was close.<\/p>\n<h3><strong>What \u201cfull working\u201d means in IGCSE terms<\/strong><\/h3>\n<p>Full working does not mean writing long essays. It means the examiner can follow your logic line by line. A strong standard is:<\/p>\n<ul>\n<li>Write the formula you are using.<\/li>\n<li>Substitute numbers clearly.<\/li>\n<li>Show at least one simplification step.<\/li>\n<li>Present the final answer with correct rounding and units of measurement.<\/li>\n<\/ul>\n<h3><strong>A minimal-working template that earns method marks<\/strong><\/h3>\n<p>Use this structure on any 3+ mark question:<\/p>\n<ul>\n<li>Statement: \u201cUsing \u2026 (rule\/formula)\u201d<\/li>\n<li>Setup: Equation or expression<\/li>\n<li>Substitution: Values inserted<\/li>\n<li>Computation: One or two clear lines<\/li>\n<li>Final: Answer + units + rounding requirement<\/li>\n<\/ul>\n<p>This is exam technique designed to protect marks even if your calculator errors appear later.<\/p>\n<h3><strong>Calculator errors: the hidden reason working matters<\/strong><\/h3>\n<p>Calculator errors often come from:<\/p>\n<ul>\n<li>Wrong degrees\/radians mode in trigonometry.<\/li>\n<li>Incorrect use of brackets.<\/li>\n<li>Copying a value wrongly from the question.<\/li>\n<li>Using a rounded intermediate value.<\/li>\n<\/ul>\n<p>If you write your substitution and intermediate values, you can spot the error during double checking. If you do not, you often cannot reconstruct what went wrong.<\/p>\n<h3><strong>Grade boundaries and why small improvements matter<\/strong><\/h3>\n<p>Grade boundaries vary by board, paper difficulty, and session. The practical takeaway is stable: a small reduction in silly mistakes can move you across a boundary because Maths marks are dense and highly separable. At Times Edu, we typically prioritize \u201cmark security\u201d before \u201ctopic expansion\u201d because improving reliability converts directly into higher grades.<\/p>\n<h3><strong>Subject selection for strong academic profiles<\/strong><\/h3>\n<p>For students building a competitive university application, Maths choices matter. From our direct experience with international school curricula, universities and sixth-form pathways value consistency and appropriate challenge more than \u201crandom difficulty\u201d. General guidance we use in counseling:<\/p>\n<ul>\n<li>If you aim for IB HL Maths AA, A-Level Maths\/Further Maths, or STEM-heavy majors, treat IGCSE Maths as a foundation and consider additional depth where your school offers it (for example, an additional maths option).<\/li>\n<li>If you target business, economics, or social sciences, high accuracy and strong grades in IGCSE Maths can be more valuable than taking an extra course and underperforming.<\/li>\n<li>If you are an international transfer student, align your Maths pathway with the next curriculum (IB, A-Level, AP) early so you do not repeat content inefficiently.<\/li>\n<\/ul>\n<p>This is where personalized planning matters, because the \u201cbest\u201d choice depends on your timeline, school offerings, predicted grades, and university targets.<\/p>\n<p><strong class=\"read-more-post\">&gt;&gt;&gt; Read more:<\/strong> <a class=\"xem-them-link\" href=\"https:\/\/times.edu.vn\/en\/igcse\/igcse-additional-maths-mistakes\/\">IGCSE Additional Maths Mistakes<\/a> 2026: Common Errors Students Make and How to Avoid Them<\/p>\n<h2><strong>Frequently Asked Questions<\/strong><\/h2>\n<div class=\"hoi-dap-thok-new low-faq tvl-auto-faq-static\">\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>Do I lose marks for not writing units in IGCSE maths?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">Yes, you can lose marks, especially when the unit is explicitly required or when the unit confirms the meaning of the value. This commonly affects questions on area, volume, speed, density, and rates, where units of measurement are part of the mathematical correctness. A reliable exam technique is to treat units as part of the final answer line, not an optional add-on.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>What happens if I use the wrong formula but get the right answer?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">It depends on whether your working demonstrates a valid method that the mark scheme recognizes. If you used a formula that is not applicable but arrived at the correct result by coincidence, you may receive the final accuracy mark but lose method marks because the approach is not creditworthy. If you show a logically valid alternative method (even if it is not the \u201cexpected\u201d one), examiners often award method marks as long as the reasoning is mathematically sound and clearly presented.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>How to avoid silly mistakes in maths exams?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">Build a repeatable routine rather than relying on \u201cbeing careful\u201d. Use a two-pass read, write minimal working to protect method marks, and apply a short double checking checklist (units, rounding, sign, bounds, calculator mode). Then practice past-paper questions with an error log focused on your personal common errors.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>Is it okay to write answers in pencil first?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">In many exam settings, diagrams and graphs may be in pencil, but final answers typically should be in pen unless the instructions allow pencil. The bigger issue is time: rewriting can increase rushing and trigger more IGCSE Maths mistakes. A safer approach is to write clearly once, and use neat crossing out if you change an answer.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>Why is showing working out so important?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">Because method marks are a large portion of many multi-step questions, and they are only awarded if the examiner can see your reasoning. Clear working also helps you detect calculator errors and mis-substitutions during double checking. Strong presentation is a scoring strategy, not a \u201cnice-to-have\u201d.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>What are the most common algebra mistakes?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">The highest-frequency errors are sign mistakes with negatives and brackets, incomplete expansion of squares, and incorrect index rules. Under exam pressure, students also lose accuracy by skipping steps in algebraic manipulation and mis-copying terms. Targeted drills and a rewrite-first strategy reduce these errors quickly.<\/div>\n<\/div>\n<div class=\"thong-tin-dai tvl-faq-item\">\n<p class=\"tit-dai\"><strong>How do I check my answers effectively during the exam?<\/strong><\/p>\n<div class=\"chi-tiet-thong-tin tvl-faq-a-inner\">Prioritize checks that catch high-impact errors fast: confirm units of measurement, confirm rounding and significant figures, and scan for negative sign issues. For probability, check the result is between 0 and 1 and confirm whether events are with or without replacement. For calculator-heavy questions, re-enter the calculation using brackets carefully to catch calculator errors.<\/div>\n<\/div>\n<\/div>\n<p><strong>Conclusion<\/strong><\/p>\n<p>Based on our years of practical tutoring at <a href=\"https:\/\/times.edu.vn\/en\/\">Times Edu<\/a>, the fastest improvement comes from treating <i>IGCSE Maths mistakes<\/i> as data. We identify your top 5 recurring error types, map them to where marks are lost (accuracy marks vs method marks), and install a simple exam technique routine that holds under time pressure. If you want a personalized IGCSE Maths improvement plan, Times Edu can build a targeted schedule using your recent past papers, your error log, and your school\u2019s board-specific mark scheme expectations. This is the most efficient way to raise grades while keeping a strong academic profile for international school transitions and university applications.<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-right kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;right&quot;,&quot;id&quot;:&quot;32839&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0110\u00e1nh gi\u00e1 b\u00e0i vi\u1ebft&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Top Common IGCSE Maths Mistakes to Avoid&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>IGCSE Maths mistakes most often come from misreading questions, losing accuracy through early rounding and incorrect significant figures, forgetting units of measurement, and making algebraic manipulation slip-ups (especially negative signs and brackets). These common errors reduce both method marks (unclear working) and accuracy marks (wrong final value), even when the core topic is understood. Strong &#8230; <a title=\"Top Common IGCSE Maths Mistakes to Avoid\" class=\"read-more\" href=\"https:\/\/times.edu.vn\/en\/igcse\/top-common-igcse-maths-mistakes-to-avoid\/\" aria-label=\"Read more about Top Common IGCSE Maths Mistakes to Avoid\">Read more<\/a><\/p>\n","protected":false},"author":7,"featured_media":32844,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","rank_math_title":"","rank_math_description":"Stop losing marks on easy questions! Discover the most frequent IGCSE Maths errors and how to fix them immediately with expert tips from Times Edu.","footnotes":""},"categories":[166],"tags":[],"class_list":["post-32839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-igcse"],"_links":{"self":[{"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/posts\/32839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/comments?post=32839"}],"version-history":[{"count":9,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/posts\/32839\/revisions"}],"predecessor-version":[{"id":34844,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/posts\/32839\/revisions\/34844"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/media\/32844"}],"wp:attachment":[{"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/media?parent=32839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/categories?post=32839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/times.edu.vn\/en\/wp-json\/wp\/v2\/tags?post=32839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}