Today we launched our area/perimeter week.
Last week I checked in with the students how much they knew/remembered about this topic, and they literally remembered nothing.
I decided to mark out an array on my classroom floor, and use this to help them understand the difference between area and perimeter.
I will acknowledge that we used "20 people" as an area measurement, which is not accurate. It should be 20cm2 or m2 etc. I said this to them as well, but regardless of the unit measurement, I think it definitely helped them understand the concept.
Before we began, I asked for prior knowledge. One of my top students (who said she did remember everything) told me that area is the outside, measured by plussing, and perimeter is the inside, measured by timsing. Er, not quite.
The array had 20 squares, and I have 20 students.
I think this lesson went really well. I liked how everybody had an opportunity to be involved which is quite rare. Even my very low students, were able to count the perimeter because they can count to 20. Using their physical bodies kept them engaged, and the students who weren't actively counting etc were still able to participate by being part of the area. I really liked watching them work together and figure it out together, with little or no teacher direction. I only stepped in when they really got stuck, or if somebody had a genius thought I wanted to point out.
By the end of the lesson, all the students were able to understand which one I was talking about if I said 'make me a shape with a area/perimeter of'. They were able to tell me which was the inside and outside, and how to figure out each one.
I'd love some critical feedback on this lesson.
Please leave me a comment on something you think I did well, and something I can work on.