Start. Give the learner the complete E source and Parts 1–2 from assessment/FIRST-CHECKS.md. Say, “Show your quantities, units and decision so someone else can follow them. You can use a diagram, table or equations.” Do not work an equivalent example with these numbers first. Keep staff keys and all change/recheck cards out of the learner's first view.
Allow 20 minutes for Parts 1–2. Preserve that first response. Reveal only E's change card from staff/REVEAL-GUIDE.md, then allow 10 minutes for Part 3. Keep both responses. Use up to 10 minutes to discuss the learner's own choice after collection. Extra processing time or a split session may be agreed; record the support and elapsed stages rather than describing the administration as identical.
Route 25A · Diagram-led response
Offer blank equal-part bars and a blank quantities table. The learner chooses and labels the representation, then completes every E part. Do not provide the number of parts, counts, unit prices, pack totals or recommendation. Record that blank representation support was available.
Route 25B · Spoken reasoning with a record
The learner explains each E part aloud, pointing to their own marks or counters. A recorder writes the learner's words and arithmetic, reads them back, and lets the learner correct them. Capture Parts 1–2 before the change card. Record prompts and transcription support. Spoken explanation here is actual learner evidence only if it occurs; a written plan is not a spoken performance.
Route 25C · Compare two of your own methods
The learner completes every E part and, for one calculation, supplies a second method of their own. They choose which method is easier to check and explain why. The comparison must be made after their first calculation, not supplied as a worked staff model. Keep the new condition withheld until the first response is captured.
Close: use the E descriptive criteria and a specific reteach branch. Prior access to the source or key ends the fresh claim; choose an unused E recheck after teaching rather than recycling the same answer as fresh evidence.