Goal: independently align a new length pair and observe a new direct mass comparison. Proposed code: AC9MFM01. Prepare: teacher-held Day 135 sets, private record; Card 135 after check only.
- Welcome · 3 min. Say there are two new object questions, not a speed race or body comparison.
- Attribute choice · 4 min. Ask which tool/action would answer “longer?” and which would answer “heavier?” without using assessment pieces.
- Fresh length · 5 min. Give unseen strips, initially shifted; child aligns and compares with first position/words recorded.
- Fresh mass · 7 min. Present verified equal containers on balance with hidden safe blocks. Child observes, names heavier side relative to other, and explains what counted as evidence.
- Boundary · 4 min. Ask one attribute the setup did not test and whether length proved mass. Save answer before key feedback.
- Close · 2 min. Select exact next move; release Card 135 practice after individual check.