# Source, mathematical and rights ledger · Year 6 maths Days 11–20

| Claim or item | Source and audit | Limit |
| --- | --- | --- |
| National Year 6 mathematics content descriptions | [Official ACARA v9 workbook](https://www.australiancurriculum.edu.au/content/dam/en/curriculum/ac-version-9/downloads/curriculum-workbook.xlsx), pinned SHA-256 `db446882d2c00cf7c085a03e250e2442fda6c44011fc114680c46c1dc7a822c3`, retrieved 29 September 2026. Exact [code/row/text crosswalk](CURRICULUM-CROSSWALK.md) checks `AC9M6N02` row17823 and `AC9M6N03` row17829. | Two descriptions and ten lessons are not the full Year 6 content set or achievement standard. This is a dated source snapshot. |
| Queensland implementation entry | [QCAA P–10 Mathematics Version 9.0](https://www.qcaa.qld.edu.au/p-10/aciq/version-9/learning-areas/p-10-mathematics), official current page checked 29 September 2026. | Queensland is the first state implementation reference. It does not assert that this particular week order is endorsed or fits every state/territory. Check local adopted documents and scope. |
| Prime/composite/square examples | Definitions and manually checked factor pairs in the [staff key](teacher/ANSWER-AND-NEXT.md); verifier audits a fixed sample with arithmetic. | Positive whole-number factor convention. `1` is square but neither prime nor composite. `0` is not a prime/composite example and is outside this fortnight's positive-square tasks. |
| Fraction positions and differences | Fixed same-size whole; 12 equal gaps per unit. Examples: `2/3=8/12`, `3/4=9/12`; `5/4=15/12`, `3/2=18/12`; fresh check `5/3=20/12`, `7/4=21/12`. [Staff key](teacher/ANSWER-AND-NEXT.md) and exact arithmetic audit in verifier. | A fraction of a different whole may produce a different tile count; physical length on the two printed lines uses different scales. No sampled learner outcome is implied. |
| Contexts and answers | Authored fictional galleries, boards, music cycles, displays, recipe cards and tile panels. | No real room layout, capacity, product, cultural practice or financial claim. All numbers are invented solely for practice. |
| Four original A4 print pairs | [Python SVG drawing source](print/generate_print.py), [full text/tactile alternatives](print/TEXT-ALTERNATIVES.md), PDF page/text/font audit and visual raster inspection. | Internal desk accessibility review only; screen-reader, tactile-print and low-vision user testing remain to be done. |
| Formative checks | Day15/20 fresh items, 7 in total, [separate staff key](teacher/ANSWER-AND-NEXT.md), specified access/content-prompt recording. | These are teaching decisions, not a validated test, grade, diagnosis or complete achievement-standard judgement. |

## Rights and attribution

- **ACARA descriptions:** © Australian Curriculum, Assessment and Reporting Authority (ACARA) 2010 to present unless otherwise indicated. The displayed [descriptions](CURRICULUM-CROSSWALK.md) are from the official workbook, with plain-text whitespace normalisation and exact row/code attribution. They are under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) subject to the [official terms and exclusions](https://www.australiancurriculum.edu.au/copyright-and-terms-of-use). No ACARA logo, third-party implementation resource or photograph is copied. ACARA does not endorse SubjectNest.
- **Original SubjectNest material:** © NeuroForgeIO Pty Ltd 2026, CC BY 4.0. Lesson language, fictional settings, examples, checks, keys, SVG layouts and full alternatives were authored for this pack. Credit SubjectNest by NeuroForgeIO Pty Ltd, link the licence and indicate changes.
- **Python tooling:** Apache-2.0, see [code licence](CODE-LICENSE.txt).
- **PDF font:** DejaVu Sans subsets remain under [DejaVu rights](print/FONT-RIGHTS.md), with the [retained notice](print/dejavu-font-copyright.txt). No standalone font is shipped.
- **First Nations cultures and languages:** no story, design, language translation, Country/Place knowledge or identity is invented here. Local cultural adaptation needs appropriate source and community review; this numerical pack does not imply it has provided one.

## Pending human review

A Year 6 educator should check lesson demand, timing and local curriculum order; access specialists and actual learners should test the formats; families can test home clarity. The [run-through](RUN-THROUGH.md) is internal simulation only. Refresh official sources and rights before new-jurisdiction release.