G2 SEC examination reasoning often succeeds or fails at the moment information changes form. A passage becomes an evidence note; a word problem becomes an equation; a table becomes a graph; a scientific diagram becomes a mechanism. These are representation handoffs.
This one-hundred-and-fourth Learner’s Guide develops representation handoffs across K200 English, K210 Mathematics and K223–K225 Science. It extends Vol 0100 Checkpoint Compression and Vol 0074 Invariant Hunting.
The handoff audit
- What information must remain invariant?
- What new structure should the new representation expose?
- What could be lost during conversion?
- What unstated assumption could be accidentally added?
- Can you translate back and recover the original meaning?
1. English passage to evidence note
Source state: A paragraph contains many details.
Handoff: Compress to source + decisive phrase + function before writing the answer.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
2. English evidence to inference
Source state: A phrase is selected.
Handoff: Translate evidence into the narrow conclusion it supports without adding motive or scope.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
3. English quotation to paraphrase
Source state: Exact wording is understood.
Handoff: Change surface language while preserving quantifier, causality and modality.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
4. English chronology to motive
Source state: Events are ordered.
Handoff: Use only information available before the action when inferring motive.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
5. English dialogue to speaker map
Source state: Several voices appear.
Handoff: Convert dialogue into speaker → claim pairs before comparing.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
6. English two texts to comparison table
Source state: Sources contain mixed claims.
Handoff: Map same criterion across Text 1 and Text 2 before synthesising.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
7. English paragraph to summary point
Source state: Examples surround one core idea.
Handoff: Strip examples while preserving unique information.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
8. English visual to prose
Source state: Image/graph accompanies text.
Handoff: Name the visible evidence before interpreting its role.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
9. English prompt to plan
Source state: Writing task has several requirements.
Handoff: Convert bullets into content obligations and audience/tone constraints.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
10. English plan to paragraph
Source state: Outline has idea cues.
Handoff: Turn each cue into a paragraph with one clear function.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
11. English oral cue to speech
Source state: Three keywords are prepared.
Handoff: Expand into natural reason/example speech without reading a script.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
12. Listening audio to note
Source state: Information arrives once.
Handoff: Compress to semantic cue, not full sentence.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
13. Mathematics words to variables
Source state: A word problem describes quantities.
Handoff: Name unknowns and units before equations.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
14. Mathematics words to equation
Source state: Relationships are verbal.
Handoff: Translate one relation at a time and check direction.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
15. Mathematics equation to graph
Source state: A relation is algebraic.
Handoff: Use graph when intersections, trend or feasible region become clearer.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
16. Mathematics graph to equation
Source state: A straight-line pattern is shown.
Handoff: Extract gradient/intercept or relevant relation only when justified.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
17. Mathematics table to graph
Source state: Paired data are tabulated.
Handoff: Plot when trend/shape is the target.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
18. Mathematics graph to table
Source state: Exact plotted values are needed.
Handoff: Read coordinates carefully and preserve scale.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
19. Mathematics diagram to equation
Source state: Geometry is visual.
Handoff: Convert labels/theorems into equations rather than measuring appearance.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
20. Mathematics equation to diagram
Source state: Spatial relation is hard to track symbolically.
Handoff: Sketch only the relationships needed.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
21. Mathematics ratio to bar model
Source state: Parts are verbally related.
Handoff: Use bars when whole/part ownership is clearer visually.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
22. Mathematics bar model to equation
Source state: Visual parts are known.
Handoff: Convert to algebra when unknown relationships become efficient to solve.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
23. Mathematics percentage to multiplier
Source state: Increase/decrease is verbal.
Handoff: Translate to 1±r before repeated calculations.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
24. Mathematics multiplier to percentage
Source state: Final/original relation is known.
Handoff: Convert back only when interpretation requires percentage change.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
25. Mathematics fraction to decimal
Source state: Comparison may be easier numerically.
Handoff: Convert without losing exactness when exact form still matters.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
26. Mathematics decimal to fraction
Source state: Exact ratio structure matters.
Handoff: Recover exact representation where possible.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
27. Mathematics units to dimensions
Source state: Formula choice is uncertain.
Handoff: Use unit structure to test the relation.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
28. Mathematics expression to estimate
Source state: Exact arithmetic is long.
Handoff: Create a rough magnitude before calculator execution.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
29. Mathematics target to dependency graph
Source state: Many intermediate quantities exist.
Handoff: Map which values unlock the target.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
30. Mathematics dependency graph to working
Source state: Route is selected.
Handoff: Execute only required branches.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
31. Mathematics cases to piecewise plan
Source state: Rule changes by condition.
Handoff: Write branch conditions before calculations.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
32. Mathematics bounds to candidate elimination
Source state: Answer interval is known.
Handoff: Reject options outside the interval before exact work.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
33. Mathematics calculator display to final form
Source state: Numeric result appears.
Handoff: Convert to requested accuracy, unit or exact interpretation.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
34. Science prose to variable map
Source state: Experiment description is long.
Handoff: Extract changed, measured and controlled variables.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
35. Science variable map to causal claim
Source state: Design is understood.
Handoff: State what comparison can test without exceeding controls.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
36. Science table to trend
Source state: Many readings appear.
Handoff: Describe direction, interval and anomaly.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
37. Science trend to mechanism
Source state: Pattern is established.
Handoff: Add a mechanism only if the question asks why and evidence supports it.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
38. Science graph to prediction
Source state: Relationship is shown.
Handoff: Predict inside range before considering extrapolation.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
39. Science diagram to process chain
Source state: System components are pictured.
Handoff: Translate arrows into ordered mechanism steps.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
40. Science process chain to explanation
Source state: Mechanism is known.
Handoff: Write cause → process → outcome.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
41. Science particle model to macroscopic observation
Source state: Microscopic mechanism is active.
Handoff: Add aggregation bridge to observed property.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
42. Science cell model to organism result
Source state: Cell process is known.
Handoff: Bridge through tissue/system rather than jumping levels.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
43. Science observation to conclusion
Source state: Evidence is measured.
Handoff: State bounded claim matching source and range.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
44. Science conclusion to limitation
Source state: Claim is made.
Handoff: Ask what design or measurement cannot exclude.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
45. Science limitation to improvement
Source state: Weakness is specific.
Handoff: Choose a repair that targets the weakness.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
46. Science anomaly to diagnostic plan
Source state: One point conflicts with trend.
Handoff: Convert surprise into a test: repeat, calibrate or check condition.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
47. Science negative result to detection model
Source state: Signal is absent.
Handoff: Ask whether test could have detected expected effect.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
48. Science control to alternative explanation
Source state: Control is present.
Handoff: Name the competitor it removes.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
49. Science model to prediction
Source state: A model is proposed.
Handoff: Generate an observable consequence before seeing result.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
50. Science prediction to model update
Source state: Data arrive.
Handoff: Retain, narrow or revise model according to mismatch.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
51. Science two evidence streams to triangulation
Source state: Different methods agree.
Handoff: Check independence before raising confidence.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
52. Science local data to system claim
Source state: One sample/site is measured.
Handoff: Check representativeness and scale before generalising.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
53. Cross-subject question to answer shape
Source state: Stem is read.
Handoff: Translate command, source, scope, count and output form.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
54. Cross-subject answer shape to evidence search
Source state: Required output is known.
Handoff: Search only for information capable of filling that shape.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
55. Cross-subject evidence to minimum-sufficient answer
Source state: Support is ready.
Handoff: Include required function and stop when complete.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
56. Cross-subject uncertainty to marker
Source state: A doubt appears.
Handoff: Convert feeling into named sign/source/unit/scope/mechanism check.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
57. Cross-subject marker to repair
Source state: The risk is named.
Handoff: Repair only the dependent branch.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
58. Cross-subject repair to verification
Source state: Correction is made.
Handoff: Check by a different route before closure.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
59. Cross-subject working to final interface
Source state: Reasoning is secure.
Handoff: Transfer number/text with label, unit, source and accuracy intact.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
60. Cross-subject final interface to review
Source state: Answer is complete.
Handoff: Audit cheap interface errors before deep re-solving.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
61. Representation loss
Source state: A conversion drops a condition or unit.
Handoff: Return to source representation and restore lost information.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
62. Representation invention
Source state: A diagram/equation adds an unstated assumption.
Handoff: Mark the assumption rather than treating it as given.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
63. Representation ambiguity
Source state: Two interpretations fit the same shorthand.
Handoff: Expand back to words before proceeding.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
64. Representation overload
Source state: A chosen format is harder than source.
Handoff: Switch to a representation that exposes the relation.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
65. Representation lock-in
Source state: Learner refuses to leave first format.
Handoff: Use a second representation when progress stalls or verification needs independence.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
66. Representation mismatch
Source state: Graph used for exact value where table is clearer.
Handoff: Choose format according to task, not preference.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
67. Representation verification
Source state: Two forms describe same relation.
Handoff: Check invariant quantities across the conversion.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
68. Representation checkpoint
Source state: Task is paused after conversion.
Handoff: Store current representation and next conversion step.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
69. Representation final rule
Source state: Every conversion should preserve meaning while exposing a useful structure.
Handoff: If information is lost or invented, the handoff failed.
For practice, perform the conversion and then translate back. If the round trip changes source ownership, quantity, condition, unit, chronology or causal strength, the handoff is not faithful. The goal is not to preserve every surface detail; it is to preserve every detail that controls correctness.
A second representation is also a check
When two representations are genuinely different, agreement between them can expose errors. An equation and a graph, a passage and an evidence map, or a mechanism and a prediction can fail in different ways. This makes representation change useful not only for solving but for verification.
Links
Use the Examination Craft hub, Vol 0096 Response-Interface Integrity, the relevant English, Mathematics and Science hubs, and the PSLE Learner’s Guide.
Official-source discipline
For the 2027 SEC G2 school-candidate framework, use the current SEAB G2 syllabus directory and linked subject syllabuses. Representation handoffs are an eduKateSengkang training framework, not an SEAB instruction.
Final rule
Change representation to expose structure, not to decorate the page. Preserve what controls meaning, avoid inventing assumptions, and verify the handoff by translating back or checking an invariant.
