Every year, thousands of bright, well-prepared students participate in the Singapore and Asian Schools Math Olympiad (SASMO). Yet even the most talented competitors fall into predictable traps that cost them valuable points. The difference between good and great performance often isn't mathematical knowledge—it's avoiding common mistakes that sabotage results. This guide identifies the most frequent errors students make in SASMO and provides practical strategies to avoid them.
Mistake Category 1: Reading and Comprehension Errors
The most frustrating mistakes are those where students knew how to solve the problem but misunderstood what was being asked. These errors are entirely preventable with careful reading habits.
Misreading the Question
This is perhaps the most common and costly error in SASMO. Students see a problem, recognize a familiar pattern, and immediately start solving—only to answer the wrong question entirely.
Common examples:
Question asks for what is NOT true; student finds what IS true
Question asks for the remainder; student calculates the quotient
Question asks for perimeter; student calculates area
Question asks for the largest value; student finds the smallest
How to avoid:
Read each question twice before starting to solve
Underline or circle key words: "NOT," "EXCEPT," "LEAST," "GREATEST"
Before solving, restate the question in your own words
After solving, check: "Does my answer actually address what was asked?"
Overlooking Important Details
SASMO questions often include crucial constraints or conditions that students miss in their rush to solve.
Common examples:
"Positive integers"—student includes zero or negative numbers
"Two-digit numbers"—student includes single-digit or three-digit numbers
"In simplest form"—student doesn't reduce fractions
"Distinct values"—student counts repeated values
How to avoid:
Highlight all conditions and constraints in the problem
Create a checklist of requirements before solving
After solving, verify your answer meets ALL stated conditions
Ask yourself: "Are there any restrictions I might have overlooked?"
Assuming Information Not Given
Students sometimes add assumptions or information that aren't actually stated in the problem, leading them down incorrect solution paths.
How to avoid:
Work only with information explicitly given in the problem
Don't assume values, relationships, or conditions not stated
If you're using information, ask: "Is this actually given, or am I assuming it?"
When in doubt, reread the problem statement carefully
Mistake Category 2: Calculation and Computational Errors
Even students with strong conceptual understanding can lose points through careless calculation mistakes. These are particularly frustrating because they don't reflect mathematical ability.
Arithmetic Errors
Simple arithmetic mistakes—addition, subtraction, multiplication, division errors—cost more points than any other single category.
Common examples:
7 x 8 = 54 (should be 56)
Carrying errors in multi-digit calculations
Decimal point placement errors
Fraction addition errors (adding numerators and denominators separately)
How to avoid:
Write calculations clearly and organize your work
Don't skip steps—write out intermediate calculations
Check arithmetic by doing it a second way (e.g., multiplication to verify division)
For critical calculations, do them twice independently
Algebraic Manipulation Errors
Students make systematic errors when manipulating algebraic expressions and equations.
Common errors:
Sign errors: -(a - b) = -a - b (should be -a + b)
Distribution errors: 2(x + 3) = 2x + 3 (should be 2x + 6)
Exponent errors: (x + y)^2 = x^2 + y^2 (should be x^2 + 2xy + y^2)
Fraction errors: 1/(x+y) = 1/x + 1/y (this is incorrect)
How to avoid:
Review fundamental algebraic rules regularly
Write each step of algebraic manipulation clearly
Check your work by substituting simple values back into expressions
Be especially careful with negative signs and distribution
Unit and Conversion Errors
Problems involving measurements often require unit conversions, and students frequently make errors here.
How to avoid:
Keep track of units throughout your solution
Convert all measurements to the same units before calculating
Check that your final answer is in the requested units
Use dimensional analysis to verify conversions make sense
Mistake Category 3: Strategy and Approach Errors
Sometimes students lose points not because of what they know, but because of how they approach the competition itself.
Poor Time Management
Spending too much time on difficult problems and running out of time for easier ones is a classic competition mistake.
The problem:
Student gets stuck on a hard problem early in the test
Spends 10-15 minutes trying to solve it
Misses 3-4 easier problems later that they could have solved
How to avoid:
Use the three-pass approach: easy problems first, medium second, hard last
Set time limits: 2-3 minutes max per problem on first pass
If stuck, mark the problem and move on immediately
Check the clock at regular intervals to stay on track
Leave at least 5-10 minutes at the end for review
Not Attempting All Problems
Some students give up on problems they perceive as too difficult without fully engaging with them, leaving easy points on the table.
How to avoid:
Attempt every problem, even if you can't solve it completely
For multiple-choice: eliminate obviously wrong answers and make educated guesses
Partial solutions may earn partial credit in open-ended questions
Write down relevant formulas or approaches even if you can't complete the solution
Getting Emotionally Hijacked by Difficult Problems
When students encounter a problem they can't solve, they may panic, lose confidence, and perform poorly on subsequent problems.
How to avoid:
Accept that you won't solve every problem—that's normal
Remind yourself: "This is hard for everyone, not just me"
Take a deep breath and reset your focus
Move to a different problem and return later with fresh perspective
Focus on what you can control: your effort and approach
Mistake Category 4: Answer Format and Presentation Errors
Students sometimes solve problems correctly but lose points because of how they present their answers.
Not Following Answer Instructions
Different questions have different answer format requirements, and students often overlook these.
Common format requirements:
"Give your answer as a fraction in simplest form"
"Round to two decimal places"
"Express as a mixed number"
"Give all possible values"
"Show your work" or "Explain your reasoning"
How to avoid:
Read answer format requirements BEFORE solving the problem
Underline format requirements in the question
Create a final checklist: "Does my answer match the requested format?"
For "show your work" questions, write clear, organized solutions
Multiple Solutions When Only One Is Needed (or Vice Versa)
Students sometimes provide only one solution when multiple exist, or provide multiple solutions when only one is requested.
How to avoid:
Read carefully: does the question ask for "all values" or "a value"?
After solving, consider: "Could there be other solutions I've missed?"
For quadratic equations, remember there are typically two solutions
Check whether constraints eliminate some potential solutions
Answer Sheet Errors
Careless errors in transferring answers to the answer sheet cost many students valuable points.
Common errors:
Bubbling in the wrong row or column
Writing answers in the wrong problem number space
Not bubbling answers darkly enough for machine reading
Forgetting to transfer answers from scratch paper
How to avoid:
Transfer answers to answer sheet immediately after solving each problem
Double-check that you're bubbling the correct row and column
At the end, verify that the number of answers matches the number of questions
If you skip a problem, mark it clearly and return to it
Mistake Category 5: Content and Knowledge Gaps
While many mistakes are about execution, some stem from genuine gaps in mathematical knowledge or understanding.
Weak Foundation in Basic Concepts
SASMO builds on fundamental mathematical concepts, and weakness in basics undermines performance on advanced problems.
Common weak areas:
Fraction operations and equivalence
Percentage calculations
Ratio and proportion
Basic geometry formulas and properties
Order of operations
How to avoid:
Identify and address weak areas well before competition
Don't neglect fundamentals while studying advanced topics
Practice basic skills regularly, not just advanced problems
Ask teachers for help with foundational concepts if needed
Unfamiliarity with Competition-Specific Topics
SASMO includes topics that may not be emphasized in regular school curriculum but appear regularly in competitions.
Commonly under-studied topics:
Number theory (divisibility rules, prime factorization, GCD, LCM)
Combinatorics (counting principles, permutations, combinations)
Logic puzzles and systematic reasoning
Sequences and patterns
Advanced geometry (circle theorems, coordinate geometry)
How to avoid:
Review the SASMO syllabus or topic list in advance
Study past papers to identify recurring topic areas
Don't avoid topics just because they're unfamiliar—learn them
Use competition preparation books that cover these topics
Surface-Level Understanding
Students sometimes know formulas or procedures without understanding when and why to apply them.
How to avoid:
Focus on understanding, not just memorization
Ask "why does this work?" for every formula or technique you learn
Practice applying concepts in varied contexts
Teach concepts to others—teaching reveals gaps in understanding
Mistake Category 6: Preparation and Planning Errors
Mistakes made before competition day can be just as costly as mistakes made during the competition itself.
Cramming Instead of Consistent Practice
Many students try to cram all their studying into the days before competition, which is far less effective than consistent practice over time.
Why cramming fails:
Information doesn't have time to consolidate in long-term memory
Fatigue reduces learning effectiveness
Stress and anxiety increase
No time for deep understanding or skill development
How to avoid:
Start preparation at least 8-12 weeks before competition
Practice regularly (3-4 times per week) rather than intensely
Review and reinforce previously learned material
Taper preparation in the final week to rest and consolidate
Only Practicing Easy Problems
Some students build confidence by only practicing problems they can easily solve, avoiding challenging problems that would actually improve their skills.
How to avoid:
Deliberately practice problems at and above your comfort level
Embrace struggle as part of learning
Track which problem types you avoid and work on them specifically
Set goals to solve increasingly difficult problems over time
Not Practicing Under Timed Conditions
Students who never practice with time limits often struggle with pace during the actual competition.
How to avoid:
Regularly do timed practice sessions simulating competition conditions
Use actual past papers when available
Practice the three-pass time management strategy
Track your pace and identify where you spend too much or too little time
Neglecting Rest and Self-Care
Students sometimes sacrifice sleep, exercise, and relaxation to study more, which actually reduces performance.
How to avoid:
Prioritize sleep, especially in the week before competition
Maintain regular physical activity
Take regular breaks during study sessions
Remember: a well-rested brain performs better than an overworked one
Mistake Category 7: Post-Competition Errors
The competition doesn't end when you hand in your paper. How you handle the aftermath matters too.
Obsessing Over Answers Immediately After
Many students spend the time immediately after competition comparing answers with peers, which often increases anxiety without providing value.
Why this is problematic:
You can't change your answers at this point
Peers may have made mistakes too—their answers aren't necessarily correct
It increases anxiety without benefit
It takes away from the learning opportunity
Better approach:
Celebrate completing the competition
Engage in a relaxing activity
Wait until results are official before analyzing performance
When you do reflect, focus on process and learning, not just outcomes
Failing to Learn from the Experience
Every competition is a learning opportunity, but students often miss this by not reflecting constructively.
How to learn effectively:
After results arrive, review your performance objectively
Identify which mistakes cost you points and why
Determine what preparation strategies worked and what didn't
Make a plan for improvement if you compete again
Focus on growth and learning, not just results
Drawing Wrong Conclusions About Ability
Students sometimes draw overly negative or overly positive conclusions about their mathematical ability based on a single competition result.
Healthy perspective:
One competition result doesn't define your mathematical ability
Performance varies based on many factors: preparation, health, luck, problem fit
Focus on long-term growth, not single events
Use the experience as data for improvement, not as a verdict on your worth
Creating Your Personal Error-Prevention Plan
Now that you know the common mistakes, create a personalized plan to avoid them:
Step 1: Self-Assessment
Review this list and identify which mistakes you've made in the past:
Which category of errors costs you the most points?
Which specific errors are most frequent for you?
Are your errors mostly about knowledge, execution, or strategy?
Step 2: Prioritize
Focus on fixing the errors that cost you the most points first:
Reading errors? Implement careful reading habits
Calculation errors? Practice checking your arithmetic
Time management? Practice the three-pass approach
Content gaps? Address specific weak areas
Step 3: Practice Prevention
Build error-prevention into your regular practice routine:
After each practice session, review not just correctness but process
Keep an error log: what mistakes did you make and why?
Develop personal checklists for reading, calculating, and answering
Practice your error-prevention strategies until they become automatic
Step 4: Simulate Competition Conditions
Practice preventing errors under realistic conditions:
Do timed practice tests
Use actual answer sheets
Simulate the competition environment as closely as possible
Practice your full error-prevention routine during these simulations
Conclusion: Excellence Through Error Prevention
The path to SASMO excellence isn't just about learning more mathematics—it's about performing the mathematics you know as accurately and effectively as possible. By identifying and eliminating common errors, you can dramatically improve your performance without necessarily learning new content.
Remember that even small improvements in error prevention can lead to significant point gains. A student who reduces careless errors by 50% might gain 10-15 points—enough to move from a silver medal to a gold medal, or from no medal to a bronze.
The most successful SASMO competitors aren't necessarily the ones who know the most mathematics—they're the ones who consistently demonstrate what they know without self-sabotage. They read carefully, calculate accurately, manage time wisely, and present answers properly.
Start implementing these error-prevention strategies in your practice today. Build the habits, checklists, and routines that will serve you on competition day. When you combine solid mathematical knowledge with careful, error-free execution, you'll be positioned to achieve your best possible performance.
The difference between good and great isn't always knowledge—sometimes it's simply avoiding the mistakes that hold you back. You have the power to eliminate those mistakes. Use it wisely.
