Teaching Patches Level 3: students draw one rectangle at a time on this 5×5 board. 10 clues, 10 with fixed areas. Walk through 10 placements before declaring the grid solved — verify no overlap and no gaps after every patch.
Board spotlight: One or more clues demand large rectangles — lock those anchors first because they consume the most territory and constrain where every smaller patch can fit. With 10 of 10 clues showing a numbered area, dimension math often pins down rectangle size before you choose a position on the grid.
General Patches strategy on 5×5: rectangles cannot overlap, every cell must belong to exactly one patch, and each patch must contain precisely one clue at its anchor cell. When a clue shows area 12 and a tall icon, only a few height×width pairs are legal — list them before drawing. After each placement, mentally partition the leftover white space: if any region cannot host its remaining clues, back up and try the next candidate.
Lesson step 1: show why 2×4 at Row 1, column 1 is forced around Row 1, column 3. The clue shows area 8, so this patch must cover exactly 8 cells (2×4 = 8). The shape icon requires a wide rectangle (wider than tall). Ask: what cells are now unavailable for other clues?
Lesson step 2: show why 3×1 at Row 1, column 5 is forced around Row 2, column 5. The clue shows area 3, so this patch must cover exactly 3 cells (3×1 = 3). The shape icon requires a tall rectangle (taller than wide). Ask: what cells are now unavailable for other clues?
Lesson step 3: show why 3×1 at Row 3, column 1 is forced around Row 4, column 1. The clue shows area 3, so this patch must cover exactly 3 cells (3×1 = 3). The shape icon requires a tall rectangle (taller than wide). Ask: what cells are now unavailable for other clues?
Lesson step 4: show why 1×2 at Row 3, column 2 is forced around Row 3, column 2. The clue shows area 2, so this patch must cover exactly 2 cells (1×2 = 2). The shape icon requires a wide rectangle (wider than tall). Ask: what cells are now unavailable for other clues?
Lesson step 5: show why 2×1 at Row 3, column 4 is forced around Row 3, column 4. The clue shows area 2, so this patch must cover exactly 2 cells (2×1 = 2). The shape icon requires a tall rectangle (taller than wide). Ask: what cells are now unavailable for other clues?
Lesson step 6: show why 1×1 at Row 4, column 2 is forced around Row 4, column 2. The clue shows area 1, so this patch must cover exactly 1 cells (1×1 = 1). The shape icon requires a square. Ask: what cells are now unavailable for other clues?
Lesson step 7: show why 2×1 at Row 4, column 3 is forced around Row 4, column 3. The clue shows area 2, so this patch must cover exactly 2 cells (2×1 = 2). The shape icon requires a tall rectangle (taller than wide). Ask: what cells are now unavailable for other clues?
Lesson step 8: show why 2×1 at Row 4, column 5 is forced around Row 4, column 5. The clue shows area 2, so this patch must cover exactly 2 cells (2×1 = 2). The shape icon requires a tall rectangle (taller than wide). Ask: what cells are now unavailable for other clues?
Lesson step 9: show why 1×1 at Row 5, column 2 is forced around Row 5, column 2. The clue shows area 1, so this patch must cover exactly 1 cells (1×1 = 1). The shape icon requires a square. Ask: what cells are now unavailable for other clues?
Lesson step 10: show why 1×1 at Row 5, column 4 is forced around Row 5, column 4. The clue shows area 1, so this patch must cover exactly 1 cells (1×1 = 1). The shape icon requires a square. Ask: what cells are now unavailable for other clues?
Recap: 10 patches, 25 cells, one partition path. Replay using constrained-clue-first ordering.