# Foundation / Prep mathematics · Weeks 27–28 · Days 131–140

**Teacher draft, 29 September 2026.** Week 27 directly compares length and mass of safe objects, naming the attribute, reference pair and observation before suggesting a use. Week 28 asks a given question about **fictional** respondents, collects/sorts one image per answer and compares only the displayed data. Open [ten 25-minute scripts](LESSONS.md), [reproducible practice sets/text alternatives](MATERIALS.md), [clean learner cards](LEARNER-CARDS.md), [teacher-held unseen checks/keys](ASSESSMENT.md), and the original A4 [comparison mat](compare-and-record.svg) and [response cards](fictional-response-cards.svg). The [Week 27](../../../term-3/week-27-objects-alike-and-different.md) and [Week 28](../../../term-3/week-28-what-we-learn-by-asking.md) integrated guides add science and HASS without collapsing evidence.

**Exact national links:** AC9MFM01 (identify/compare attributes including length/mass by direct comparison and reason) and AC9MFST01 (collect, sort, compare object/image data for a given familiar investigative question). Exact Foundation Year wording, workbook rows and partial evidence are in the [source and review ledger](QA-RUN-THROUGH.md) against the [official ACARA v9 curriculum workbook](https://www.australiancurriculum.edu.au/downloads), retrieved 29 September 2026, SHA-256 `db446882d2c00cf7c085a03e250e2442fda6c44011fc114680c46c1dc7a822c3`. Length/mass and data do not exhaust either content description or establish achievement-standard attainment.

**Method:** align endpoints for length; use a checked equal-arm balance or matched-container heft route for mass. Do not infer mass from size, colour or material label. Preflight the exact physical sets; if a balance gives a different result, repair or relabel the set before teaching rather than scoring against a fictional expected outcome. One card means one **invented** recorded response in Week 28; no actual child is surveyed by default. A real voluntary, anonymous object question needs local consent, opt-out and storage/retention procedure. Never infer class preference from fictional data or an absent respondent.

**Access:** large safe pieces, tactile edges, described bars, equal-sized containers, guided touch by choice, child-directed adult placement, visual/AAC/sign/voice responses. A learner can compare through a described/directly felt arrangement, with access support recorded. Adult reading of categories is not a mathematics error. No named child, voice/photo, home object, purchase or device is required.

Original SubjectNest scripts, sets, keys and vector aids © 2026 NeuroForgeIO Pty Ltd, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Credit, link and indicate changes. ACARA retains its terms. Human educator, access, safety, state syllabus and classroom trial review pending.