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O-Level Command Words: Describe, Explain, Suggest, Deduce, Compare

O-Level command words is not extra terminology around the subject; it tells students what mathematical or examination action the question requires. Command words tell students what kind of response to produce even when the underlying knowledge stays the same. This page begins with a usable vocabulary bank, then turns each term into an answer frame, representation or reasoning move so that language and subject knowledge work together.

Searches for O-Level command words often overlap with O-Level exam command words, E-Math word problems, A-Math vocabulary, secondary Mathematics keywords and how to answer describe/explain/compare questions. The shared difficulty is translation. A student can know a concept and still lose marks if the command, qualifier or relationship is misread.

Underline the command word before answering. State/identify usually require concise information; describe requires relevant features or changes; explain requires reasons or mechanism; suggest asks for a plausible response; deduce/infer require a conclusion from evidence; compare requires explicit relationships between items. Use this page with the Singapore Vocabulary Guide and the eduKate Vocabulary Learning System.

Quick Read

  • 20 high-utility command words.
  • Convert each command into an answer frame.
  • Correct knowledge can still miss the command.
  • Use evidence and mark context to control depth.
  • Useful across O-Level materials and newer secondary assessment contexts.

The short answer

Underline the command word before answering. State/identify usually require concise information; describe requires relevant features or changes; explain requires reasons or mechanism; suggest asks for a plausible response; deduce/infer require a conclusion from evidence; compare requires explicit relationships between items.

20 secondary command words and the answer each one asks for

1. state

state: give the required fact concisely. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

2. identify

identify: name or select the relevant feature. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

3. name

name: supply the correct term. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

4. define

define: give the meaning precisely. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

5. describe

describe: give relevant features or what happens. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

6. explain

explain: give reasons, mechanism or causal links. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

7. suggest

suggest: propose a plausible response using information. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

8. deduce

deduce: reach a conclusion from evidence. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

9. infer

infer: derive a likely conclusion from information. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

10. compare

compare: state relevant similarities and/or differences. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

11. contrast

contrast: focus on differences. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

12. calculate

calculate: use information and mathematical steps to obtain a value. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

13. determine

determine: work out or establish from data or reasoning. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

14. justify

justify: support an answer with reasons or evidence. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

15. outline

outline: give the main points. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

16. evaluate

evaluate: judge using evidence, criteria or limitations. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

17. predict

predict: state a likely outcome from a pattern or principle. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

18. show

show: demonstrate through working or evidence. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

19. complete

complete: fill missing information accurately. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

20. estimate

estimate: give a reasonable approximate value. Before answering, turn the command into an answer frame. Then write a near-miss response that contains correct subject knowledge but fails to obey the command. Repair it and explain what changed.

O-Level and SEC transition note

Singapore’s secondary assessment landscape is transitioning, but command-word literacy remains useful across current O-Level resources and newer SEC contexts. Students should always follow the syllabus, paper wording and mark requirements for the assessment they are actually sitting.

Language controls the answer shape

Underline the command, relationship or qualifier before solving. Convert it into a mental frame: describe what changes, explain why, compare A with B, show working, identify a value, or justify a choice. This prevents correct knowledge from being poured into the wrong response shape.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Represent the meaning

Translate important words into an equation, graph feature, diagram, inequality or answer structure. Then translate the representation back into words. Bidirectional translation reveals whether the student truly understands the term.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

The Fencing Method

Place near-terms side by side and state the boundary. State/describe/explain; factor/term/coefficient; at least/at most; tangent/chord; increase by/increase to. Minimal pairs reveal the exact word that changes the mathematical or response requirement.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Units and conditions

Words such as respectively, constant, exact, approximate, per, no more than and integer constrain the answer. They are not minor details. Annotate them before calculation so the model respects every condition.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Worked reasoning

For each term, create one question where it is central and one near-miss question where a related term would change the method. Solve both. Contrastive problems make vocabulary differences memorable because they change what the student does.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Retrieval

Close the page and retrieve from a representation. Show a graph and ask for gradient, intercept, turning point or increasing. Give an instruction and ask which command word would produce it. Reverse practice creates stronger access.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Error diagnosis

Separate vocabulary misunderstanding from mathematical or subject error. If the student built the wrong equation from correct arithmetic, repair language-to-model translation. If the model was correct but execution failed, repair the mathematical process.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

Transfer

Move the vocabulary across textbook questions, unfamiliar contexts and timed practice. A term is mastered when it triggers the correct reasoning even when the surface story changes.

Apply this directly to O-Level command words: choose three terms from the bank, build a question for each, represent the meaning and create one plausible but wrong interpretation. Explain the boundary before solving.

30 translation drills

Drill 1

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 2

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 3

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 4

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 5

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 6

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 7

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 8

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 9

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 10

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 11

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 12

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 13

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 14

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 15

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 16

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 17

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 18

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 19

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 20

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 21

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 22

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 23

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 24

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 25

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 26

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 27

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 28

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 29

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Drill 30

Choose one term from this page. Write a question that makes the term essential, convert it to a representation or answer frame, and solve or answer it. Then change one word so a different method or depth is required. Compare the two versions.

Frequently asked questions

Should students memorise definitions?

Definitions are a start; the term must also trigger the correct representation or answer action.

Why do command words matter?

They specify the response shape and often the depth of reasoning expected.

Are keyword tricks reliable in Mathematics?

No single word should override the full relationship and conditions.

How should parents help?

Ask the student to explain the wording before calculating.

How should teachers diagnose errors?

Separate language interpretation, representation and execution.

Can one term have an everyday and mathematical meaning?

Yes. Context decides which technical meaning applies.

How should vocabulary be revised?

Inside real subject questions, not only as isolated flashcards.

What shows mastery?

The student can translate accurately from wording to reasoning and back again.

Continue through the Singapore Vocabulary Guide.

Explore the connected learning guides

Choose the question that brought you here. Open one useful guide, try a small task, and stop when you have what you need.

Take one question further

The same learning habit can travel across subjects, while each subject keeps its own methods. These routes help you notice a difficulty, understand one part of it, and return to something you can do.

A word is familiar, but using it is difficult.

Move from recognising a word to retrieving it in a new context. Understand vocabulary plateaus.

Try it without the guide: Choose one word you already know. Close the guide and use it in a new sentence. Explain why it fits; try another context tomorrow.

A piece of writing has ideas, but the reader loses the thread.

Make the order of events and the links between sentences clear. Explore composition writing.

Try it without the guide: Choose one short paragraph. Read the relevant explanation, close it, and revise the paragraph. Ask someone to tell you what happened and why.

The Mathematics seems familiar, but marks still disappear.

Find the first point where the working stops being reliable. Find Secondary 4 A-Math mark leakage.

Try it without the guide: For a Secondary 4 A-Math question you have attempted, locate the first uncertain line. Repair that step, then try a comparable question without the worked answer.

A Science fact is remembered, but the explanation is incomplete.

Connect the evidence to a scientific idea and the resulting change. Follow the Primary Science learning route.

Try it without the guide: Choose a familiar Primary Science example. Explain the evidence, the idea and the result without notes. Then change one condition and explain your prediction.

Two accounts of the world seem to disagree.

Check the question, source, date and evidence before combining claims. Explore the World Knowledge research library.

Try it without the guide: Take one claim. Find the source best placed to support it, note its date, and state what remains uncertain. Return to your original question.

There is plenty of help, but independence is hard to see.

Check what the learner can understand and do after support is removed. Understand how education works.

Try it without the guide: Choose one small task the child has practised. Agree on a calm, brief attempt without prompts. Use what happens to choose one next step, then stop.

For the structure behind these connections, read the eduKateSingapore runtime manifest and the eduKate ecosystem boot contract. The reader map describes public navigation; those manifests preserve the wider ownership and return rules.