# Staff key: d-later

Source and own response remain separate. Preserve first thinking and actual support before reading this key into feedback. A correct supplied value is not independent discovery.

## Question 1: Verdict

**Look for in this source:** Ten and twenty-seven account for thirty-seven; this claim is valid.

**Next teaching for this question:** Compare a new valid ten/eight account for eighteen with a ten/seven claim without saying which has an error.

**Later invitation:** choose a new complete case after that teaching. Record changed quantity/arrangement and prior familiarity; do not repeat this exact answer until memorised.

## Question 2: Decision

**Look for in this source:** Keep the valid account with checked equality. A new valid split may be offered, but need not be called a repair of an error.

**Next teaching for this question:** Ask what actual mismatch needs a repair; if none, retain a supported new valid account.

**Later invitation:** choose a new complete case after that teaching. Record changed quantity/arrangement and prior familiarity; do not repeat this exact answer until memorised.

## Question 3: Two parts

**Look for in this source:** Another valid partition of thirty-seven, such as twenty/seventeen or thirty/seven; source values alone are not a new plan.

**Next teaching for this question:** Change a divider in a new thirty-three collection and count both parts.

**Later invitation:** choose a new complete case after that teaching. Record changed quantity/arrangement and prior familiarity; do not repeat this exact answer until memorised.

## Question 4: Three parts

**Look for in this source:** Three nonnegative whole parts account for thirty-seven once, such as ten/twenty/seven; other valid accounts accepted.

**Next teaching for this question:** Audit all three regions of a new twenty-five collection to find omitted/duplicated members.

**Later invitation:** choose a new complete case after that teaching. Record changed quantity/arrangement and prior familiarity; do not repeat this exact answer until memorised.

Accept different supported valid partitions subject to the particular question constraints. Record each component independently, with actual source/range/support. Maths hints, access supports and adult physical acts stay distinct. No speed, neatness, voice or motor score; no five-point grade inferred from four questions.

Original SubjectNest teaching and drawings © NeuroForgeIO Pty Ltd 2026, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Credit SubjectNest by NeuroForgeIO Pty Ltd, version 0.1.0, source and licence; note changes. Curriculum and provider rights remain separate.

Modified from the named State of Queensland (QCAA) [Years 1–2 techniques/conditions, October 2023](https://www.qcaa.qld.edu.au/downloads/aciqv9/mathematics/assessment/ac9_maths_technique_cond_yr1-2.pdf), [Year 1 standards elaborations, April 2025](https://www.qcaa.qld.edu.au/downloads/aciqv9/mathematics/assessment/ac9_maths_se_yr1.pdf) and [complexity/familiarity advice,2025](https://www.qcaa.qld.edu.au/downloads/aciqv9/mathematics/assessment/ac9_maths_create_questions_complex_familiar_yr1.pdf). Original mathematical tasks/criteria are ours; adapted conditions and folio guidance retain © QCAA 2023/2025, CC BY 4.0 subject to [QCAA copyright](https://www.qcaa.qld.edu.au/copyright), exclusions/third-party notices and no endorsement. No source student work/media/marks/glossary is supplied.