The 20-route learning estate
eduKateSengkang is organised as a Learning Castle: existing subject hubs, level routes, examination routes and learning-system pages retain their jobs. This page is the master upgrade directory. It does not replace those owners. It makes the work visible, assigns every upgrade to one route, and gives new or substantially revised articles stable IDs so later batches can be connected without losing track of what is complete.
Numbering rule
Each route has a -000 hub pointer. Article slots then use reserved tens: -010, -020, -030 and so on. The first upgrade programme reserves up to 150 article slots per route, ending at -1500. Existing high-value URLs are upgraded in place wherever practical; the ID identifies the editorial job, not a requirement to create a new URL.
| Route | Hub ID | Primary job | Existing owner / destination | Reserved article IDs | Status |
|---|---|---|---|---|---|
| SK-01 | SK-01-000 | Homepage, Sengkang Tuition, commercial/navigation/root accuracy | Homepage / Tuition Centre owner | SK-01-010–SK-01-1500 | OPEN |
| SK-02 | SK-02-000 | Primary 1–3 English | Primary English Learning Hub | SK-02-010–SK-02-1500 | OPEN |
| SK-03 | SK-03-000 | Primary 4–6 English + PSLE English | Primary English Learning Hub / PSLE Learning Guide | SK-03-010–SK-03-1500 | OPEN |
| SK-04 | SK-04-000 | Secondary 1–2 English | English Hub | SK-04-010–SK-04-1500 | OPEN |
| SK-05 | SK-05-000 | Secondary 3–4 English + SEC English | English Hub | SK-05-010–SK-05-1500 | OPEN |
| SK-06 | SK-06-000 | Vocabulary, grammar, reading, writing and English skills | Complete English Index | SK-06-010–SK-06-1500 | OPEN |
| SK-07 | SK-07-000 | Primary 1–3 Mathematics | Mathematics Hub | SK-07-010–SK-07-1500 | OPEN |
| SK-08 | SK-08-000 | Primary 4–6 Mathematics + PSLE Mathematics | Mathematics Hub / PSLE Learning Guide | SK-08-010–SK-08-1500 | OPEN |
| SK-09 | SK-09-000 | Secondary 1–2 Mathematics | Mathematics Hub | SK-09-010–SK-09-1500 | OPEN |
| SK-10 | SK-10-000 | Secondary 3–4 Mathematics + SEC Mathematics | Mathematics Hub | SK-10-010–SK-10-1500 | OPEN |
| SK-11 | SK-11-000 | Additional Mathematics | Additional Mathematics owner | SK-11-010–SK-11-1500 | OPEN |
| SK-12 | SK-12-000 | Primary 3–4 Science | Science Hub | SK-12-010–SK-12-1500 | OPEN |
| SK-13 | SK-13-000 | Primary 5–6 Science + PSLE Science | Science Hub / PSLE Science Learning Guide | SK-13-010–SK-13-1500 | OPEN |
| SK-14 | SK-14-000 | Secondary Science + scientific reasoning | Science Hub | SK-14-010–SK-14-1500 | OPEN |
| SK-15 | SK-15-000 | Learning Castle, Learning Runtime and study methods | Learning Runtime Hub | SK-15-010–SK-15-1500 | OPEN |
| SK-16 | SK-16-000 | Examination performance, revision, assessment and error repair | Examination Craft | SK-16-010–SK-16-1500 | OPEN |
| SK-17 | SK-17-000 | Parent guides, tuition, teaching and student support | Parents’ Guide | SK-17-010–SK-17-1500 | OPEN |
| SK-18 | SK-18-000 | Algorithms, computing and advanced mathematics | Algorithms & Computing Hub | SK-18-010–SK-18-1500 | OPEN |
| SK-19 | SK-19-000 | Advanced science and world-knowledge science material | Complete Science Index | SK-19-010–SK-19-1500 | OPEN |
| SK-20 | SK-20-000 | Estate archaeology: duplication, location leakage, orphan control, cannibalisation and consolidation candidates | Learning Castle Registry | SK-20-010–SK-20-1500 | OPEN |
Article register
The first-wave titles and status ledger are live in the eduKate Sengkang Article Register | SK-01 to SK-20. Use it to claim the next article ID, see protected owners and avoid duplicating work already active in another branch.
Protection-first reader standard
All 20 branches now follow the eduKate Sengkang Reader Experience Standard: protect strong pages, connect isolated pages, improve formatting only where it helps, use bounded surgery for specific defects, and modernise only when the existing article no longer completes its reader job.
Article state
Every inspected URL receives one state before work begins: PROTECT for ranking or strategically sensitive owners; KEEP for sound pages needing no substantial rewrite; MODERNISE for useful but outdated pages; SURGERY for small bounded repairs; RETARGET for pages that need a distinct adjacent search job; CONSOLIDATION CANDIDATE for overlapping intent that requires owner review; LOCATION LEAKAGE for misplaced locality; or HISTORICAL for material worth preserving without major reinvestment.
Completion rule
An article ID becomes complete only when the assigned existing URL or new article has a defined reader job, correct owner, current factual scope, useful internal return path and no unresolved collision with another Sengkang owner. A branch can therefore inspect more than 150 URLs without rewriting 150 pages. The 150 slots are a controlled first-wave capacity, not a quota.
Castle relationship
This programme sits under the existing Learning Castle and follows its one-owner-many-routes rule. English, Mathematics, Science, Examination Craft, Learning Runtime and Algorithms retain their existing canonical roles. The master directory exists to coordinate upgrades and make unfinished work visible; it does not create twenty competing subject hubs.
Complete-index crosswalk
Use the 20 routes above to decide ownership and upgrade work. Use these Complete Archives when the job is enumeration, orphan control or direct deep-article discovery.
English Archive · Mathematics Archive · Science Archive · Examination Archive · Learning Runtime Archive · Algorithms & Computing Archive
Deep fallback discovery
The subject hubs and Complete Archives remain the preferred routes. These live indexes are the final orphan-control layer: they expose every published Page and Post through paginated internal links so newly published or unusually placed content still has a crawlable return path while specialist routing is updated.
Browse every published Page
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Primary 4 Mathematics Learning Guide | Angles, Protractor Reading, Symmetry and Spatial Construction
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Primary 4 Mathematics Learning Guide | Area, Perimeter, Angles, Symmetry and Nets
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Primary 4 Mathematics Learning Guide | Assumption Method: Supposition, Excess, Difference and Word Problems
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Primary 4 Mathematics Learning Guide | Before-and-After Problems: Unknown Start, Change and Final Quantity
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Primary 4 Mathematics Learning Guide | Composite Figures, Missing Lengths and Boundary Tracing
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Primary 4 Mathematics Learning Guide | Constant Difference: Equal Changes, Comparison and the Gap That Stays the Same
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Primary 4 Mathematics Learning Guide | Constant Total: Transfers, Redistribution and the Quantity That Does Not Change
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Primary 4 Mathematics Learning Guide | Data, Word Problems, Strategy Choice and Self-Checking
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Primary 4 Mathematics Learning Guide | Decimal Measurement, Place Value and Rounding Accuracy
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Primary 4 Mathematics Learning Guide | Diagnostic Assessment, Capability Profile and Repair Routing
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Primary 4 Mathematics Learning Guide | Division, Remainders, Equal Grouping and Quotient Interpretation
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Primary 4 Mathematics Learning Guide | Equal Concept: Equal at First, Equal at End and Before–After Models
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Primary 4 Mathematics Learning Guide | Error Atlas, Misconceptions, First Weak Link and Correction
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Primary 4 Mathematics Learning Guide | Factors, Multiples, Common Factors and Common Multiples
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Primary 4 Mathematics Learning Guide | Fraction Addition, Subtraction, Common Denominators and Mixed Contexts
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Primary 4 Mathematics Learning Guide | Fraction Word Problems, Reference Wholes and Mixed Numbers
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Primary 4 Mathematics Learning Guide | Fractions, Decimals and Number Relationships
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Primary 4 Mathematics Learning Guide | Grouping Concept: Quantity × Value, Equal Sets and Regrouping
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Primary 4 Mathematics Learning Guide | Home Learning, Homework Independence and Parent Support
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Primary 4 Mathematics Learning Guide | Length: Kilometres, Metres, Centimetres and Compound Units
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Primary 4 Mathematics Learning Guide | Mass: Kilograms, Grams and Compound Units
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Primary 4 Mathematics Learning Guide | Mathematical Communication, Complete Working and Explanation
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Primary 4 Mathematics Learning Guide | Mixed Problem Laboratory, Interleaving and Transfer
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Primary 4 Mathematics Learning Guide | Mixed-Topic Problems, Representation Choice and Error Recovery
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Primary 4 Mathematics Learning Guide | Money in Decimal Notation, Change, Budgeting and Word Problems
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Primary 4 Mathematics Learning Guide | Multiple Solution Routes: Choosing, Comparing and Verifying Mathematics Strategies
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Primary 4 Mathematics Learning Guide | Multiplicative Comparison, Bar Models and Unknown Units
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Primary 4 Mathematics Learning Guide | Nets, 2D Representations and 3D Spatial Reasoning
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Primary 4 Mathematics Learning Guide | Number Sequences, Rounding, Estimation and Approximation
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Primary 4 Mathematics Learning Guide | Part-Whole, Difference and Equal-Group Models: Choosing the Correct Bar Model
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Primary 4 Mathematics Learning Guide | Patterns and Generalisation: Observe, Predict, Test and Explain
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Primary 4 Mathematics Learning Guide | Practice Paper: Arithmetic, Reasoning and Mixed Review with Worked Solutions
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Primary 4 Mathematics Learning Guide | Problem Posing, Changing Conditions and Creating Valid Questions
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Primary 4 Mathematics Learning Guide | Repeated Identity: Linked Comparisons, Shared Quantity and Model Drawing
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Primary 4 Mathematics Learning Guide | Revision Strategy: Topic Checklist, Weak-Link Repair and Assessment Readiness
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Primary 4 Mathematics Learning Guide | Shortage and Surplus: Excess, Deficit, Fixed Groups, Left Over and Short Of
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Primary 4 Mathematics Learning Guide | Simplifying Problems: Smaller Numbers, Simpler Cases and Rebuilding the Original
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Primary 4 Mathematics Learning Guide | Single Unchanged Quantity: Constant Single Subject and Before–After Reasoning
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Primary 4 Mathematics Learning Guide | Special Cases, Boundaries, Counterexamples and Impossible Cases
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Primary 4 Mathematics Learning Guide | Speed and Accuracy: Efficient Working, Pacing and Error Prevention
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Primary 4 Mathematics Learning Guide | Systematic Listing, Tables and Guess-and-Check
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Primary 4 Mathematics Learning Guide | Tables, Line Graphs, Pie Charts and Scale Reading
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Primary 4 Mathematics Learning Guide | Translating Representations: Words, Tables, Number Lines, Bar Models and Equations
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Primary 4 Mathematics Learning Guide | Unitary Method: One Unit, Fractional Part, Find the Whole and Scale Up
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Primary 4 Mathematics Learning Guide | Volume of Liquid: Litres, Millilitres and Compound Units
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Primary 4 Mathematics Learning Guide | Whole Numbers, Factors, Multiples and the Four Operations
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Primary 4 Mathematics Learning Guide | Working Backwards: Inverse Operations and Missing Quantities
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Primary 4 Mathematics Learning Hub | Number, Fractions, Geometry, Data and Problem Solving
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Primary 4 Mathematics Sengkang | The Voyage of Water
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Primary 4 Mathematics Sengkang | Upper-Primary Straddle Diagnostic
Browse every published Post
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PSLE Science Reality Lab Vol No.544 | “Overall AQI = 160” — Is That the Average Pollution Score Across All Pollutants?
13–20 minutes -
PSLE Science Reality Lab Vol No.550 | “Accessioned in 1985” — Was the Specimen Collected in 1985?
17–25 minutes -
PSLE Science Reality Lab Vol No.549 | “Control = 1.0; Treatment = 1.4” — Were Those the Raw Measurements?
11–16 minutes -
PSLE Science Reality Lab Vol No.548 | “Pipette Set to 100 µL” — Did It Deliver Exactly 100.000 µL?
12–18 minutes -
PSLE Science Reality Lab Vol No.547 | “Tare = 0.000 kg” — Does That Mean the Empty Container Has No Mass?
10–16 minutes -
PSLE Science Reality Lab Vol No.543 | “LiDAR Point Density = 8 points/m²” — Does Every Square Metre Contain Exactly Eight Points?
13–19 minutes -
PSLE Science Reality Lab Vol No.542 | “Filter Capacity = 1,000 Gallons” — Does It Work Perfectly Until Gallon 1,000 and Fail at 1,001?
11–17 minutes -
PSLE Science Reality Lab Vol No.541 | “Ventilation Fan = 100 CFM” — Will It Move 100 CFM After Any Installation?
12–17 minutes -
PSLE Science Reality Lab Vol No.540 | “Pixel Value = 12,000 DN” — Is That Already a Physical Reflectance Measurement?
15–22 minutes -
PSLE Science Reality Lab Vol No.538 | “Absorbance = 2.0” — Did the Sample Absorb Twice as Much Light as Absorbance = 1.0?
15–22 minutes -
PSLE Science Reality Lab Vol No.537 | “This Museum Dinosaur Is One Skeleton” — Did Every Display Bone Come From One Animal?
15–23 minutes -
PSLE Science Reality Lab Vol No.536 | “Least Concern” — Does That Mean a Species Has No Conservation Problems?
12–19 minutes -
PSLE Science Reality Lab Vol No.535 | “AUC = 0.90” — Is the Classifier 90% Accurate?
14–21 minutes -
Top 10 Value-of-Information Skills Worth Learning
11–16 minutes -
Top 10 Decision Threshold Skills Worth Learning
10–15 minutes -
Top 10 Diagnostic Reasoning Skills Worth Learning
10–14 minutes -
Top 10 Counterexample Reasoning Skills Worth Learning
10–15 minutes -
PSLE Science Reality Lab Vol No.539 | “Result: R — Rejected” — Does That Mean the Substance Was Not There?
19–28 minutes -
Top 10 Reliability Reasoning Skills Worth Learning
11–17 minutes -
Top 10 Optimization Skills Worth Learning
10–15 minutes -
Top 10 Risk Reasoning Skills Worth Learning
9–14 minutes -
Top 10 Evidence Weighting Skills Worth Learning
11–17 minutes -
PSLE Science Reality Lab Vol No.534 | “Six Check Results Keep Rising but Stay Inside the Limits” — Can We Ignore the Trend?
10–15 minutes -
PSLE Science Reality Lab Vol No.533 | “Proficiency-Test z-Score = 0.2” — Is the Laboratory 99.8% Accurate?
9–13 minutes -
PSLE Science Reality Lab Vol No.532 | “Water-Quality Geometric Mean = 40” — Were Most Samples About 40?
10–15 minutes -
PSLE Science Reality Lab Vol No.531 | “The Radar Map Is Blank in This Wedge” — Does That Mean No Rain Fell There?
12–18 minutes -
PSLE Science Reality Lab Vol No.528 | “Slope = 100%” — Does 100% Mean a Vertical Cliff?
9–14 minutes -
PSLE Science Reality Lab Vol No.527 | “The Change Map Shows a Red Edge” — Did the Ground Really Change, or Were the Images Slightly Misaligned?
13–19 minutes -
PSLE Science Reality Lab Vol No.526 | “The Line Connects the Measurements” — Was the Value Measured at Every Moment Between the Dots?
10–14 minutes -
PSLE Science Reality Lab Vol No.525 | “Result Above Calibration Range” — Can We Trust the Exact Concentration?
10–15 minutes -
PSLE Science Reality Lab Vol No.524 | “This Scatter Plot Shows 80 Visible Dots” — Were There Only 80 Measurements?
10–16 minutes -
Top 10 Debugging Skills Worth Learning
12–17 minutes -
PSLE Science Reality Lab Vol No.523 | “Sample Receipt Temperature = 4°C” — Was the Sample Kept at 4°C for the Whole Journey?
11–17 minutes -
Top 10 Scenario Reasoning Skills Worth Learning
12–18 minutes -
Top 10 Sensitivity Analysis Skills Worth Learning
12–18 minutes -
Top 10 Robustness Skills Worth Learning
13–20 minutes -
PSLE Science Reality Lab Vol No.522 | “Cited 1,000 Times” — Does That Mean a Scientific Paper Was Confirmed 1,000 Times?
13–20 minutes -
PSLE Science Reality Lab Vol No.521 | “This Histogram Has Two Peaks” — Does That Prove the Measurements Form Two Natural Groups?
13–20 minutes -
PSLE Science Reality Lab Vol No.520 | “Weather Model Grid Spacing = 1 km” — Is the Forecast Accurate to Within 1 km?
12–19 minutes -
PSLE Science Reality Lab Vol No.519 | “This Species Map Shows a Point Here” — Was the Organism Observed at That Exact Public Location?
13–19 minutes -
PSLE Science Reality Lab Vol No.518 | “Satellite Revisit Time = 5 Days” — Will There Be a Usable Image Every Five Days?
13–19 minutes -
Top 10 Ethical Reasoning Skills Worth Learning
15–23 minutes -
Top 10 Visual Literacy Skills Worth Learning
14–21 minutes -
PSLE Science Reality Lab Vol No.517 | “Laboratory Control Sample: PASS” — Does That Prove the Real Sample Had No Matrix Interference?
10–15 minutes -
Top 10 Constraint Reasoning Skills Worth Learning
14–21 minutes -
Top 10 Scale Reasoning Skills Worth Learning
15–22 minutes -
PSLE Science Reality Lab Vol No.516 | “This LiDAR Intensity Patch Is Bright” — Is the Ground Higher or Naturally Brighter?
10–16 minutes -
PSLE Science Reality Lab Vol No.515 | “This Seafloor Patch Is Bright on the Sonar Map” — Is It Shallower Water?
10–15 minutes -
PSLE Science Reality Lab Vol No.514 | “The Cloud Is Directly Above This Spot” — Could Satellite Parallax Shift Its Apparent Position?
11–17 minutes -
PSLE Science Reality Lab Vol No.513 | “This Water Is Brilliantly Bright in the Satellite Image” — Is Something Bright Floating on the Surface?
12–18 minutes
Routing rule: use this fallback only for discovery and orphan control. Canonical subject ownership, reader pathways and return logic continue to come from the Learning Castle, subject hubs and Complete Archives.
