PSLE topic guides › Maths › Ratio

PSLE Ratio — how to do ratio questions, and the mistakes that cost marks

Maths · 8 practice questions in the free bank

PSLE Ratio: quick answers for parents

The short version, then the full guide below.

SubjectMaths · Singapore PSLE
LevelPrimary 5 and Primary 6
Free questions on Ratio8 in the free month bank, each marked step by step
How the work is markedStep by step — the written steps are marked separately, so you can see which step broke
Written workingIncluded — the bank has written workings, not only multiple-choice questions
CostFree for your first month. No signup and no card
Exam year2026 PSLE

Practise Ratio free →

Or take the free 3-minute diagnostic to see which Maths topics are actually weak before spending time on Ratio.

What Ratio means in the PSLE

Ratio is a tested maths topic in the Singapore PSLE. The marks are not usually lost because a child does not know the method — they are lost in one specific step, and because nobody can tell the child which step went wrong, the same mistake repeats.

A real Ratio question, worked step by step

Question (3 marks): Sam and Tim share a box of stickers in the ratio 3 : 5. Tim has 40 more stickers than Sam. How many stickers does each boy have?
Step 1 — In parts, how many MORE parts does Tim have than Sam?

5 − 3 = 2 parts more.

Where children go wrong: Compare the two numbers in the ratio: 5 − 3.
Step 2 — Those 2 parts are the 40 extra stickers. How many stickers is 1 part?

1 part = 40 ÷ 2 = 20 stickers.

Where children go wrong: 40 covers 2 parts, so divide 40 by 2.
Step 3 — How many stickers does Sam have?

Sam = 3 parts = 3 × 20 = 60.

Where children go wrong: Sam is the 3 in the ratio 3 : 5.
Step 4 — How many stickers does Tim have?

Tim = 5 parts = 5 × 20 = 100. Check: 100 − 60 = 40 ✔

Where children go wrong: Tim is the 5 in the ratio 3 : 5.

Why the wrong answer looks right

Question: A box contains only red, blue and green beads in the ratio 3 : 5 : 2. There are 36 more blue beads than green beads. How many red beads are there?

Options: a) 24 · b) 36 · c) 60 · d) 108

Correct answer: B

Choosing A: You found 1 unit = 12, then multiplied by 2 — that counts the green beads. The question asks for red.
Instead: Red takes 3 units: 3 x 12 = 36.
Choosing C: You multiplied 1 unit by 5, the blue beads' share. In 3 : 5 : 2, red is the 3.
Instead: Red = 3 x 12 = 36.

How to help your child with Ratio at home

Five things that work, and they use the same method as the worked example above.

1. Get the steps said out loud before anything is written

Marks in Ratio are usually lost in one step, not across the whole question. Ask your child to say each step before writing it — a broken step is much easier to catch when you can hear it.

2. Mark the working, not just the final answer

A tick or a cross on the last line tells you nothing about where the thinking broke. Read the working line by line and ask, for each line, what it was for.

3. Name the step that broke, in your child's own words

One sentence is enough. Name the step rather than the topic — “I divided before finding one part” tells you what to fix next; “I am bad at Ratio” does not.

4. Keep the sets short

The free bank has 8 Ratio questions, marked step by step, and it needs no signup. A short set with the working marked tells you more than a long page of answers.

5. “Careless” mistakes are usually one repeated step

When the same mark keeps disappearing it is rarely carelessness at random — it is one step done the same wrong way each time. Read a week of working and look for the line that is identical and wrong; that is the step to fix.

Practise Ratio free

Every question in this topic is marked step by step, so when your child goes wrong you can both see exactly which step broke. No signup.

Practise Ratio free →

Or take the free 3-minute diagnostic to see which topics are actually weak.

Questions parents ask about Ratio

Is Ratio tested in the PSLE?

Yes — Ratio is a Maths topic in the Singapore PSLE, and the free Kyly Tuition bank holds 8 questions on it for P5 and P6 pupils.

Why do children lose marks in Ratio?

Usually not because they do not know the method. They lose marks in one specific step, and because the mistake is never identified, they practise more of the same and repeat it.

Is the practice free?

Yes. The daily drills are free in all four subjects for your first month, with no signup and no card required. The free diagnostic is also free.

Does this cover Paper 2?

Yes. The bank includes step-marked written problem sums, not only multiple-choice questions, and each step is marked separately.

How do I help my child with Ratio at home?

Mark the working, not just the answer, and name the one step that broke. The guide above walks through a real Ratio question step by step, and the free bank marks each written step separately, so you can see which step went wrong instead of only seeing that the answer is wrong.

How many free Ratio questions are there?

8 questions on Ratio are in the free Kyly Tuition bank, each marked step by step, with no signup and no card.

Where do children usually lose marks in Ratio?

Usually in one specific step rather than across the whole question. The worked example above shows a real Ratio question and flags the step children break on it.

Is PSLE Maths Paper 2 written working included?

Yes. Maths Paper 2 is the written-working paper rather than multiple choice, and the free bank includes those written sums. Each step is marked separately, so a correct method that slips in one step still shows exactly where it went wrong.

Why does my child keep making careless mistakes in PSLE Maths?

'Careless' mistakes are usually not random — the same step is done the same wrong way each time. Read a few days of working and look for the line that is identical and wrong; fixing that one step is what moves the mark. Every question in the free bank is marked step by step, so a repeated step shows up.

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