Every year, we meet Primary 6 students who understand their Math topics well, yet keep losing marks in the same predictable ways. The good news is that these mistakes are not a sign of weak ability. They are habits, and habits can be fixed. Here are the five most common Math mistakes we see in P6 students in Singapore, and what actually works to correct them before the PSLE.
Mistake 1: Misreading problem sums
PSLE problem sums are written to be read carefully. Words like 'altogether', 'remaining', 'twice as many' and 'left over' completely change what the question asks. Many students skim the question, grab the numbers, and start calculating before they know what is being asked.
The fix: train your child to underline the final question sentence first, then read the problem again from the top. Ask them to say out loud, in their own words, what the question wants. If they cannot say it, they are not ready to solve it.
Mistake 2: Skipping working to save time
Some students do steps mentally to go faster, then lose both the answer mark and the method marks when the mental step goes wrong. In PSLE Math, method marks are real marks. A correct method with a small arithmetic slip still earns most of the points.
The fix: make neat, complete working a non-negotiable habit in every practice session, not just in exams. Speed comes from fluency, not from skipping steps.
Mistake 3: Weak fraction and ratio foundations
A large share of P6 problem sums are really fraction and ratio questions in disguise. When a student treats '3/5 of the remainder' as '3/5 of the total', everything downstream collapses. This is the single most common conceptual gap we see.
The fix: go back to drawing models. A bar model forces the student to see what the fraction refers to. Ten minutes of model drawing a day repairs this gap faster than pages of drill.
Mistake 4: Not checking whether the answer makes sense
A shop cannot sell 4.7 pencils. A person cannot be 230 cm tall. Students who never ask 'does this answer make sense?' hand in impossible answers without noticing.
The fix: build a ten-second sense check into the routine. After each answer, ask: is the size reasonable? Is the unit right? Is it bigger or smaller than the starting amount, and should it be? For a full routine your child can use in every paper, read our guide to avoiding careless mistakes in Math.
Mistake 5: Poor time management in Paper 2
Students get stuck on one hard 5-mark question, burn fifteen minutes, and then rush through questions they could have answered easily. The marks lost are rarely on the hard question. They are on the easy ones that never got a fair attempt.
A simple rule that works: if a question has not moved after three minutes, mark it, move on, and come back. Banks of easy marks should never be sacrificed for one stubborn question.
How we fix these at AZKEN
In our small-group P6 Math classes, we mark working, not just answers, so we can see exactly which habit is costing your child marks. Once the pattern is visible, the fix is usually quick. If your child keeps losing marks in ways that feel random, they are probably not random at all. WhatsApp us at 8166 1212 or book a trial class through our Schedule page.
Frequently Asked Questions
Why does my child keep losing marks in PSLE Math despite knowing the topics?
In our experience the marks are usually lost to habits, not gaps: misreading problem sums, skipping working, weak fraction and ratio foundations, and no checking routine. Once the specific habit is named, the fix is usually quick.
How do we help our child with PSLE problem sums?
Train the reading before the solving. Have your child underline the final question sentence, restate the problem in their own words, and only then start working. Bar models help enormously with fraction and ratio questions.
Should my child practise with past-year PSLE papers?
Yes, but with full working shown and time limits applied, not as a question bank. Method marks are real marks, and a correct method with a small slip still earns most of the points.
What should my child do when stuck on a hard question?
Mark it and move on after about three minutes. Easy marks elsewhere are worth more than one stubborn 5-mark question, and coming back later with fresh eyes often solves it faster.
Want personalised guidance for your child?
Every student learns differently. At AZKEN, Mr Ken Lim designs personalised learning plans that address your child's specific needs and goals.
Mr Ken Lim
Founder & Lead Educator, AZKEN
- Teaching Mathematics & Science since 2010
- Founder of AZKEN
- Primary Science, Primary Mathematics and Secondary Mathematics educator
With over a decade of experience teaching Science and Mathematics in Singapore, Mr Ken Lim has helped hundreds of students build confidence and achieve their academic goals. He believes every child can excel with the right guidance and encouragement.