General Exam Prep

Unfamiliar Math Question? Use the 5-Step SOLVE Strategy

Every exam has questions you have never seen before. Learn the SOLVE framework to tackle unfamiliar math questions with confidence at PSLE and O-Level.

30 March 2026 9 min read

Unfamiliar Math Question? Use the 5-Step SOLVE Strategy

Every PSLE and O-Level paper has 1-3 questions that look nothing like your practice papers. Most students panic. Top scorers don’t — they use a system. Here’s the exact framework to turn “I’ve never seen this before” into “I know what to do.”

You’ve done hundreds of practice papers. You’ve memorised every formula. You sit down, flip to the first page, and breeze through the first few questions.

Then you hit that question.

It doesn’t look like anything from your assessment book. The wording is strange. You read it once, twice, three times — and your mind goes blank.

Sound familiar? You’re not alone. And here’s the thing: this question was designed to do exactly that.

Why Exams Have “Never-Seen-Before” Questions

Here’s a truth most students don’t realise: examiners deliberately include unfamiliar questions. It’s not a mistake. It’s not unfair. It’s the entire point.

About 60% of PSLE Paper 2 tests non-routine problem solving — questions that can’t be answered by memorising steps alone. O-Level papers are even more demanding, with higher-order application questions worth 6-10 marks each.

💡 What Examiners Are Really Testing

Unfamiliar questions don’t test whether you’ve seen this exact problem before. They test whether you understand the underlying concept well enough to apply it in a new situation. That’s the difference between a student who memorises and a student who truly understands.

The good news? These questions almost always use concepts you already know — just dressed up differently. A ratio question might be hidden inside a story about sharing pizza. A percentage question might appear as a discount-on-discount scenario you’ve never practised.

The concepts are familiar. Only the packaging is new.

And that means you can learn a system to “unwrap” any unfamiliar question. We call it the SOLVE framework.

The SOLVE Framework

SOLVE is a 5-step system for attacking any question that makes you think “I’ve never seen this before.” It’s based on the same principles that mathematician George Pólya identified in his famous problem-solving research, adapted specifically for Singapore Math exams.

StepActionTime
SStop and read again30 sec
OOrganise what you know30 sec
LLink to something familiar30 sec
VVisualise with a diagram1 min
EExecute and show everythingremaining

Total setup time: about 2.5 minutes before you start solving. That investment pays back massively.

Let’s break down each step.


S — Stop and Read Again

Your first instinct when you see a strange question is to panic. Your heart rate spikes, your brain screams “I don’t know this!” and you either freeze or rush into a calculation.

Don’t.

Instead: put your pen down. Take one slow breath. Then read the question again — slowly, word by word.

Here’s what to do on your second read:

  • Circle every number and quantity
  • Underline exactly what the question is asking for
  • Box any keywords that hint at the math topic (e.g., “remaining,” “ratio,” “increased by,” “altogether”)

⚠️ The Re-Reading Rule

Research shows that many “unfamiliar” questions become clear on a careful second read. Students who rush through the question once are 3x more likely to misidentify what’s being asked. The 30 seconds you spend re-reading saves minutes of going down the wrong path.

Ask yourself these three questions:

  1. What information am I given?
  2. What do I need to find?
  3. Are there any conditions or constraints? (e.g., “at least,” “not more than,” “whole numbers only”)

If you can answer these three questions, you’ve already conquered the hardest part — understanding the problem.


O — Organise What You Know

Now take everything you identified in Step S and write it down neatly. This isn’t “working” yet — it’s preparation. Think of it like laying out your ingredients before cooking.

Write down:

  • All given values with labels (e.g., “Ali’s stickers = 120, Ben’s stickers = ?”)
  • Any formulas that might be relevant (even if you’re not sure yet)
  • What type of math this could involve (ratio? percentage? algebra? geometry?)

For PSLE students, organise into a simple list:

Given: Total stickers = 120, Ali has 3 times as many as Ben
Find: How many stickers does Ben have?
Type: Ratio / Multiples

For O-Level students, also note:

  • Which topic(s) might apply
  • Whether you need exact values or can use a calculator
  • If it’s a “show that” question (your answer is already given — you need to prove it)

💡 The 'Type' Trick

Identifying the math type is half the battle. Even when a question looks completely foreign, the underlying math is always something you’ve studied. Ask yourself: “Is this about fractions? Ratios? Speed? Angles? Algebra?” Just naming the category narrows your approach dramatically.


This is the most powerful step — and the one most students skip.

Ask yourself: “What does this remind me of?”

Every unfamiliar question is built on familiar foundations. Your job is to find the connection. Here are three techniques:

Technique 1: Simplify the Numbers

Replace the scary numbers with simple ones. If the question uses 37.5% and 712\frac{7}{12}, mentally swap them for 50% and 12\frac{1}{2}. Can you solve the simpler version? If yes, use the same method with the real numbers.

Technique 2: Strip the Story

Remove the context entirely. “A bakery sells muffins in boxes of 6 and cupcakes in boxes of 8. They sold 120 items total…” becomes “Two groups of items, one in 6s and one in 8s, total 120.” Suddenly you might recognise it as a simultaneous equation or a guess-and-check problem.

Technique 3: Work Backwards from the Answer

If you’re told to “find the ratio,” think: “What kind of question gives me a ratio as the answer?” That’s probably a before-and-after problem, or a comparison problem. Now you know which tools to use.

Linking in Action

Unfamiliar Question:

“A rectangular tank measuring 40 cm by 30 cm by 25 cm is half-filled with water. 15 identical metal cubes of side 2 cm are dropped into the tank. By how much does the water level rise?”

Your brain says: “I’ve never practised this exact question!”

Linking process:

  • Simplify: “Something goes into water, water rises” — this is a displacement question.
  • Strip the story: Volume of cubes added → water rises by some height in a rectangular tank.
  • What do I know?: Volume of a cube = side3^3. Volume of water rise = length ×\times width ×\times height rise.

The link: This is just a volume question in disguise. The total volume of the cubes equals the volume of the water that rises.


V — Visualise with a Diagram

If Steps S, O, and L haven’t cracked the question yet, this step almost certainly will. Draw something.

The Singapore Math curriculum emphasises heuristics — and the single most powerful heuristic is drawing a diagram. The MOE prescribes 12 problem-solving heuristics, and visual representation appears in nearly every one.

What to draw depends on the question type:

Question TypeBest Diagram
Sharing / ComparisonBar model
Before and AfterTwo bar models (before & after)
Speed / Distance / TimeTimeline or journey diagram
GeometrySketch with labels
Fractions / RatiosBar model with units
Patterns / SequencesTable of values
Algebra word problemsLet statements + bar model

Rules for good diagrams:

  1. Label everything — numbers, units, unknowns
  2. Keep it simple — rough sketches are fine, not art class
  3. Show relationships — which is bigger? What’s equal? What changes?

💡 The Diagram Difference

Students who draw diagrams on unfamiliar questions score an average of 2-3 more marks than those who try to solve everything in their head. A diagram doesn’t just help you solve the problem — it also earns method marks even if your final answer is wrong.


E — Execute and Show Everything

You’ve read carefully, organised your information, linked to familiar concepts, and drawn a diagram. Now it’s time to solve.

But here’s the critical rule for unfamiliar questions: show every single step.

Why Showing Working Matters More Than Ever

For familiar questions, you might skip steps because the method is obvious. For unfamiliar questions, every line of working is potential marks.

PSLE: Markers award marks for correct methods even if the final answer is wrong. Writing “15 cubes ×\times 8 cm3^3 = 120 cm3^3” earns you marks even if you make a calculation error later.

O-Level: Method marks (M marks) are explicitly awarded. A 5-mark question might give M1 for setting up the equation, M1 for the correct method, A1 for intermediate values, and A2 for the final answer. You can score 3/5 without getting the final answer right.

The “Something Is Better Than Nothing” Rule

If you’re stuck halfway through:

  1. Write down what you’ve calculated so far — don’t erase it
  2. State what you would do next — even “I would divide by 5 to find one unit” shows understanding
  3. Write a reasonable estimate if you can’t get the exact answer

❌ Never Leave It Blank

A blank answer is always 0 marks. A partial attempt with some correct working can earn 1-3 marks. On a 100-mark paper, rescuing just 3-4 marks from “impossible” questions can move you up an entire grade.

The Final Check

After solving, spend 30 seconds on a sanity check:

  • Does the answer make sense? (A person can’t be 450 years old. A ratio can’t be negative.)
  • Did you answer what was actually asked? (The question asked for Ben’s stickers, not Ali’s.)
  • Are the units correct? (cm vs m, minutes vs hours, $ vs cents)

SOLVE in Action: Full Worked Examples

Let’s walk through two complete examples — one PSLE-level and one O-Level — using every step of the SOLVE framework.

PSLE Example: The Ribbon Question

Question:

Mei has a ribbon that is 240 cm long. She cuts it into three pieces. The first piece is twice as long as the second piece. The third piece is 30 cm shorter than the first piece. What is the length of the longest piece?

S — Stop and Read Again

  • Numbers: 240 cm, three pieces, twice, 30 cm shorter
  • Find: length of the longest piece
  • Condition: three pieces must add up to 240 cm

O — Organise

  • 1st piece = 2 ×\times 2nd piece
  • 3rd piece = 1st piece - 30
  • Total = 240 cm
  • Type: looks like a ratio / units problem

L — Link

  • “Twice as long” → one quantity is a multiple of another → bar model with units!
  • This is like those “comparison” questions where everything links back to one unknown unit

V — Visualise

Let the 2nd piece = 1 unit

PieceBar ModelExpression
2nd1 unit
1st▮▮2 units
3rd▮▮ minus 302 units - 30

E — Execute

Total: 1 unit + 2 units + (2 units - 30) = 240

5 units - 30 = 240

5 units = 270

1 unit = 54 cm

  • 2nd piece = 54 cm
  • 1st piece = 108 cm
  • 3rd piece = 108 - 30 = 78 cm

Check: 54 + 108 + 78 = 240 ✓

Longest piece = 108 cm (the 1st piece)

O-Level Example: The Water Tank

Question:

Tap A can fill a tank in 6 hours. Tap B can fill the same tank in 4 hours. Both taps are turned on at the same time. After 1 hour, Tap A is turned off. How much longer does Tap B take to fill the remaining tank?

S — Stop and Read Again

  • Two taps with different rates
  • Both on for 1 hour, then only Tap B continues
  • Find: how much longer after the first hour (not total time)

O — Organise

  • Tap A: fills whole tank in 6 hours → rate = 16\frac{1}{6} tank per hour
  • Tap B: fills whole tank in 4 hours → rate = 14\frac{1}{4} tank per hour
  • Phase 1: both taps for 1 hour
  • Phase 2: only Tap B until full
  • Type: rates problem

L — Link

  • “Filling a tank” = a rate of work question
  • Similar to “speed” problems where distance = speed ×\times time, here volume = rate ×\times time

V — Visualise

Think of the tank as “1 whole”:

PhaseTapsDurationFilled
1A + B1 hour16+14=512\frac{1}{6} + \frac{1}{4} = \frac{5}{12}
2B only? hoursremaining

E — Execute

After Phase 1: 512\frac{5}{12} of tank is filled

Remaining: 1512=7121 - \frac{5}{12} = \frac{7}{12}

Tap B fills at 14\frac{1}{4} tank per hour

Time for Phase 2: 712÷14=712×4=73=213\frac{7}{12} \div \frac{1}{4} = \frac{7}{12} \times 4 = \frac{7}{3} = 2\frac{1}{3} hours

Check: Total filled = 512+14×73=512+712=1\frac{5}{12} + \frac{1}{4} \times \frac{7}{3} = \frac{5}{12} + \frac{7}{12} = 1

Tap B takes 2132\frac{1}{3} hours (or 2 hours 20 minutes) more.


The Secret: Most “New” Questions Are Old Questions in Disguise

Here’s a cheat sheet of common disguises that examiners use:

It Looks Like…It’s Actually…
A confusing story about sharing foodA ratio question
Something about filling pools or tanksA rate question
A weird pattern with shapes or numbersA number pattern / sequence
A long paragraph about buying and sellingA percentage (profit/loss) question
A question about folding paper or shadowsA geometry (similar triangles) question
”After giving away… he had…”A before-and-after bar model
Two people working togetherCombined rates (add the rates)

Once you identify the disguise, you already know how to solve it.


What NOT to Do When You’re Stuck

Knowing what to do is important. Knowing what to avoid is equally important.

1. Don’t stare for 5+ minutes. If SOLVE doesn’t crack it in 3 minutes, skip it strategically and come back later. Your subconscious will keep working on it.

2. Don’t erase everything and restart. Your first attempt often contains useful working. Build on it — don’t destroy it.

3. Don’t leave it completely blank. Even writing “Volume of cubes = 15 ×\times 232^3 = 120 cm3^3” on an otherwise unsolved question could earn you a mark.

4. Don’t let one hard question ruin the rest of your paper. The biggest danger isn’t getting one question wrong — it’s letting the frustration cause careless mistakes on the easy questions that follow.

💡 The 3-Minute Rule

Give yourself a maximum of 3 minutes on the SOLVE framework. If you have a clear path forward by then, keep going. If not, skip it, finish the paper, and return with fresh eyes. Students who come back to a skipped question solve it 40% more often than those who stubbornly push through the first time.


Quick Reference: The SOLVE Poster

Save this for your revision notes:

StepWhat to DoKey Question
StopRead again. Circle, underline, box.”What am I given? What must I find?”
OrganiseList values, formulas, math type.”What type of math is this?”
LinkConnect to familiar problems.”What does this remind me of?”
VisualiseDraw a diagram, model, or table.”Can I see the relationships?”
ExecuteSolve step-by-step. Show everything.”Does my answer make sense?”

Start Practising SOLVE Today

The SOLVE framework isn’t something you use only on exam day. The best way to master it is to practise it on purpose:

  1. Pick a question from an unfamiliar topic in your assessment book
  2. Cover the solution
  3. Walk through all 5 steps of SOLVE, writing each one out
  4. Compare your approach with the given solution

Do this 2-3 times a week, and unfamiliar questions will stop feeling scary. They’ll start feeling like puzzles — and you’ll have the tools to solve every one.

Ready to Practise Problem Solving?

Our AI tutor gives you unfamiliar questions tailored to your level — and guides you through solving them step by step using Socratic questioning.

Start Practising Now →

Topics covered:

unfamiliar math questions PSLE Math strategy O-Level Math exam tips SOLVE strategy math problem solving Singapore Math heuristics exam technique hard math questions non-routine problems Polya problem solving

Want personalized AI tutoring?

Get step-by-step help with practice problems and instant feedback.

Sign up for free