# A new A case: first thinking

A new original field has twelve marks. Put five in a first-job place and every remaining mark in a second-job place. No remaining-part answer is printed.

[Original source aid](../aids/a-first-source.svg) · [Full source description](../aids/a-first-source-alternative.md).

1. Show how you included every mark once.

2. How many marks are in the second job?

3. Show a different two-part plan for this same whole.

4. How can you check the whole stayed the same?

Keep your first idea before help. You can point, select, speak, sign, use AAC or direct an adult’s marks/moves. Tell the grown-up if the amount or layout needs changing.

<details><summary>Grown-up help</summary>

Use after Day 43 as appropriate. [Empty own response](../assessment/a-first-own.md) and [separate key](../assessment/a-first-key.md) have different roles. [Fresh preparation and eligibility](SELECT.md). Source givens, adult movements, mathematical hints and actual smaller ranges are named. This is a formative case, not secure or a whole-year grade.

</details>
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.