PSLE Math Percentage: Avoid These Common Mistakes for Full Marks

Quick answer

Running out of time and panicking during PSLE Math can cost you marks, especially in percentage questions. Understanding key mistakes and using simple, clear steps can help you tackle these questions with confidence. Let's break it down so you don't lose marks unnecessarily.

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What you need to know

A percentage represents a part of a whole, expressed as a fraction of 100. In exams, percentage questions often require you to find parts of amounts or compare values. Visualising these concepts can make them easier to understand.

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Mistakes students make

Forgetting to Convert

Many students forget to convert percentages to decimals or fractions when solving problems. For example, 25% should be converted to 0.25 or $\frac{1}{4}$ before multiplying with a number. Always remember this step.

Misreading the Question

Sometimes, percentage questions can be tricky in how they are worded. I've seen students lose marks by assuming they know the question after a quick glance. Read carefully, especially the parts that say "more than" or "less than."

Not Showing Working

In PSLE Math, showing your working is crucial. You might get some marks even if the final answer is wrong. Write each step clearly to avoid careless mistakes.

Exam tip

Always allocate a specific amount of time to percentage questions. If you find yourself stuck, move on and come back later. Mark these questions so you don’t forget to revisit them. Presentation is key: clear working can earn you method marks even if your final answer isn't perfect.

Worked examples

Question 1

A shop offers a 20% discount on a shirt that costs $50. What is the discounted price?

Solution

Step 1: Convert the percentage to a decimal: $20\% = 0.20$
Why: We need the decimal form to multiply with the price.

Step 2: Calculate the discount amount: 50 \times 0.20 = \10$
Why: This gives us the amount to deduct from the original price.

Step 3: Subtract the discount from the original price: 50 - 10 = \40$
Why: This gives us the final price after the discount.

Question 2

A student scored 40 out of 50 in a test. What is the percentage score?

Solution

Step 1: Divide the score by the total marks: $\frac{40}{50} = 0.8$
Why: This gives us the fraction of marks obtained.

Step 2: Convert to percentage: $0.8 \times 100 = 80\%$
Why: Multiplying by 100 gives the percentage.

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Quick summary

• Convert percentages to decimals or fractions before calculations.
• Read questions carefully to avoid misinterpretation.
• Show your working to secure method marks.
• Allocate time wisely, and move on if you're stuck.
• Practice similar questions regularly to build confidence.

FAQ

Q: How do I convert percentages to decimals?
A: To convert a percentage to a decimal, divide by 100. For example, $25\%$ becomes $0.25$.

Q: What if I don't understand the question immediately?
A: Don't panic. Take a deep breath, read the question again, and underline key parts. If still unsure, move to the next question and return later.

Q: How much working should I show?
A: Show each step clearly. Even if your final answer is incorrect, clear steps can earn you partial marks.

Q: What if I run out of time?
A: Prioritise questions you find easier and ensure you attempt all questions with at least some working shown.

Practise with free question sets

Work through exam-style questions with answers and step-by-step solutions:

• [35+ P 6 PSLE Percentage Questions for 2026/2027 (Singapore MOE Syllabus) with Answers and Explanations](/questions/p 6-percentage-questions)
• Topic study hub

[Practise unlimited questions on Tutorly.sg/app](https://www.tutorly.sg/app)

Related Topics You Should Learn Next

• PSLE Mathematics: Mastering Percentages with Confidence
• PSLE Mathematics: Percentage Mistakes That Cost Marks
• PSLE Mathematics: Mastering Percentage with Simple Steps
• PSLE Math Practice Questions Singapore: A Targeted Worksheet Guide With Full Solutions

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