Fraction Addition

Repair one procedural error while preserving the student's understanding of common denominators.

Tutor-visible context

Student context

Procedural Error

Current student message

“I found the common denominator for 2/3 + 1/3, but I wrote 3/6. Where did I go wrong?”

Problem context

The student understands the key concept and is stuck at the final procedural step.

Learning objective

Repair one procedural error while preserving the student's understanding of common denominators.

Context window

Conversation history

No prior conversation. This case starts with the current student message.

Public boundary

What this page does not expose

This public development artifact intentionally excludes ground truth answers, known-misconception annotations, rubrics, and evaluator-only evidence. A future hidden challenge dataset must use the same fail-closed serialization boundary.