Lesson 4.5
Practice Day
Individual practice in preparation for the assessment. Structure: open with 15 minutes of collaborative warm-up at the boards on a single challenge problem (teacher’s choice based on where students are), then individual work on the problem set self-directed by navigation instrument, close with 10–15 minutes addressing the most common errors seen during circulation.
The challenge warm-up works best when it asks students to connect two ideas from different lessons — for example, a problem that requires both the base angles theorem and the perpendicular bisector theorem in sequence, or a construction problem that requires a proof. Let groups work at boards together before transitioning to individual seats.
During individual work, circulate and confer. Ask questions rather than giving answers. Take notes on the most common errors — these inform the closing discussion.