# Staff key: c-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: Start

**Look for in this source:** Twenty-five and seventeen account for forty-two; their values are supplied source data.

**Next teaching for this question:** On a new twenty-two account, show ten/twelve cover the whole once.

**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: Direction

**Look for in this source:** Exactly three leave first part and enter second.

**Next teaching for this question:** On a new nine/six account, transfer one at a time and track three departures/arrivals.

**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: New parts

**Look for in this source:** Twenty-two and twenty after transfer.

**Next teaching for this question:** On a new eighteen/seven account transfer three, then count both parts and connect both labels.

**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: Whole

**Look for in this source:** The whole stays forty-two because no original object is added/removed; only membership changes.

**Next teaching for this question:** Use a new fifteen-object set and remove each object from its old place as it enters the new part.

**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.