For the past couple of days, we have been slowly practicing and repeating solids of revolution. The way we did it was with these strips with problems on them. I would do one with them and then have them do one. E, once students would finish, I would deem them able to check other students answer and then they would all work together until everyone finished a set of problems. Then we would do another strip together that was a bit more difficult. Here was the progression we did:
- Simple regions over x and y axes (discs)
- Simple regions over other axes (discs)
- Regions requiring washers over x and y axes (washers)
- Regions rearing washers over other axes (washers)
This step by step adding of complexity and guided practice took a while (3 full 45 minute class periods), but by the end, I felt that everyone was getting them totally correct. The mistakes were all minor too, and NOT major conceptual mistakes. Success, I hope! We will see on Monday during our quiz.