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
2756 results found
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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
3746 results found
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PSLE Science Reality Lab Vol No.510 | “Composite Reflectivity = 55 dBZ” — Was 55 dBZ Measured at the Same Height Everywhere?
11–16 minutes -
PSLE Science Reality Lab Vol No.509 | “Pressure = 2000 dbar” — Is the Argo Float Exactly 2000 m Deep?
11–17 minutes -
PSLE Science Reality Lab Vol No.506 | “Wind Barb = 25 kt” — What Does the Weather Symbol Actually Encode?
10–16 minutes -
PSLE Science Reality Lab Vol No.505 | “Power Factor = 0.90” — Does That Mean the Device Is 90% Energy Efficient?
13–19 minutes -
PSLE Science Reality Lab Vol No.503 | “Cloud-Top Height = 12 km” — Was 12 km Directly Measured at Every Pixel?
14–21 minutes -
PSLE Science Reality Lab Vol No.502 | “Peak Ground Acceleration = 30% g” — Was the Ground Accelerating at 30% g the Whole Time?
14–21 minutes -
PSLE Science Reality Lab Vol No.501 | “Leq = 70 dBA” — Was the Sound 70 dBA the Whole Time?
13–19 minutes -
PSLE Science Reality Lab Vol No.499 | “Q30 Sequencing Quality” — Was the DNA Read 30 Times, or Is It 30% Accurate?
13–19 minutes -
PSLE Science Reality Lab Vol No.498 | “Occupancy Probability = 0.80” — Does the Species Occupy 80% of This Grid Cell?
13–20 minutes -
PSLE Science Reality Lab Vol No.497 | “Band 13 = 10.33 µm” — Did the Satellite Measure Only One Exact Wavelength?
14–21 minutes -
PSLE Science Reality Lab Vol No.495 | “Total Exposure Time = 20 Hours” — Was This One 20-Hour Photograph?
12–18 minutes -
PSLE Science Reality Lab Vol No.494 | “5σ Discovery” — Does Five Sigma Mean the Signal Is Five Times Stronger Than the Noise?
13–19 minutes -
PSLE Science Reality Lab Vol No.493 | “Lightning Count = 100” — Were There 100 Separate Flashes?
15–22 minutes -
PSLE Science Reality Lab Vol No.492 | “The Funnel Plot Looks Asymmetrical” — Does That Prove Studies Were Hidden?
21–32 minutes -
PSLE Science Reality Lab Vol No.491 | “This Wind Streamline Curves Here” — Did One Air Parcel Follow That Exact Path?
15–22 minutes -
PSLE Science Reality Lab Vol No.490 | “Warm-Up Time = 30 min” — Can We Trust the Reading Immediately After Switch-On?
13–19 minutes -
PSLE Science Reality Lab Vol No.486 | “MPN = 100 per 100 mL” — Were Exactly 100 Microorganisms Counted?
11–16 minutes -
Top 10 Model-Based Reasoning Skills Worth Learning
21–32 minutes -
Top 10 Statistical Reasoning Skills Worth Learning
22–33 minutes -
PSLE Science Reality Lab Vol No.489 | “Data Updated Today” — Were the Measurements Collected Today?
11–17 minutes -
PSLE Science Reality Lab Vol No.485 | “Extent of Occurrence = 10,000 km²” — Does the Species Occupy Every Point Inside That Boundary?
10–15 minutes -
Top 10 Systems Thinking Skills Worth Learning
22–33 minutes -
PSLE Science Reality Lab Vol No.484 | “Rainfall = T (Trace)” — Does That Mean No Rain Fell?
11–16 minutes -
PSLE Science Reality Lab Vol No.488 | “Dashed Fault Line” — Does a Broken Line Mean the Fault Stops or Is Not Real?
10–15 minutes -
Top 10 Argumentation Skills Worth Learning
21–32 minutes -
Top 10 Causal Reasoning Skills Worth Learning
20–31 minutes -
PSLE Science Reality Lab Vol No.483 | “IP67” — Does That Mean a Device Is Waterproof at Any Depth for Any Length of Time?
12–18 minutes -
PSLE Science Reality Lab Vol No.487 | “Species Distribution Map” — Does the Shaded Area Mean the Species Lives Everywhere Inside It?
15–22 minutes -
Top 10 Analogical Reasoning Skills Worth Learning
20–30 minutes -
Top 10 Spatial Reasoning Skills Worth Learning
21–31 minutes -
Top 10 Information Foraging Skills Worth Learning
25–38 minutes -
PSLE Science Reality Lab Vol No.482 | “Solar Flare X2” — Is It Just Two Units Stronger Than M2?
10–14 minutes -
PSLE Science Reality Lab Vol No.481 | “Earthquake Beachball” — Is the Black-and-White Circle a Map of the Fault on the Ground?
11–17 minutes -
PSLE Science Reality Lab Vol No.480 | “This Area Is Jurassic” — Did Every Rock Here Form at the Same Exact Time?
11–17 minutes -
PSLE Science Reality Lab Vol No.479 | “Preserved Specimen Record: 1924” — Does That Mean the Species Still Lives There Today?
9–14 minutes -
PSLE Science Reality Lab Vol No.478 | “Earthquake Depth = 10 km” — Was It Really Measured Exactly 10 km Deep?
11–16 minutes -
PSLE Science Reality Lab Vol No.477 | “DYFI Intensity VI for This ZIP Code” — Did Every Place There Experience Intensity VI?
11–17 minutes -
PSLE Science Reality Lab Vol No.476 | “Coordinate Uncertainty = 1000 m” — Was the Real Location Exactly 1000 m From the Map Point?
10–15 minutes -
PSLE Science Reality Lab Vol No.475 | “Complete Checklist” — Did the Observer Detect Every Bird That Was Present?
11–16 minutes -
PSLE Science Reality Lab Vol No.474 | “Magnitude 2 vs Magnitude 4” — Is 4 Twice as Bright as 2?
10–14 minutes -
PSLE Science Reality Lab Vol No.473 | “Long-Exposure Star Trails” — Did the Stars Really Draw Bright Lines Across Space?
10–14 minutes -
PSLE Science Reality Lab Vol No.472 | “30× Genome Coverage” — Was Every DNA Base Read Exactly 30 Times?
9–14 minutes -
PSLE Science Reality Lab Vol No.471 | “Phase-Folded Light Curve” — Is This One Continuous Orbit?
11–16 minutes -
PSLE Science Reality Lab Vol No.470 | “Research Grade” — Does That Mean the Species Identification Is Definitely Correct?
11–16 minutes -
PSLE Science Reality Lab Vol No.469 | “GPS Track” — Did the Animal Really Walk Along Every Straight Line on the Map?
11–17 minutes -
PSLE Science Reality Lab Vol No.468 | “Data Deficient” — Does That Mean the Species Is Safe, Rare or Unstudied?
11–17 minutes -
PSLE Science Reality Lab Vol No.467 | “Holotype” — Is This Specimen the Average Member of the Species?
13–19 minutes -
PSLE Science Reality Lab Vol No.466 | “Raw Image” — Is This Exactly the Original Science Data From the Spacecraft?
10–14 minutes -
PSLE Science Reality Lab Vol No.465 | “I² = 80%” — Does That Mean 80% of the Studies Disagree?
8–13 minutes -
PSLE Science Reality Lab Vol No.464 | “δ18O = −10‰” — Is 10‰ of the Water Oxygen-18?
9–13 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.
