Saturday, 6 February 2016

Starter:

My grade 9 applied math class went something like this on Friday:
A number of students remembered the song from Sesame Street and I'm hoping they all understood the concept. One student was a being a smartass, so I ran with it, and we checked each of the plates to make sure that there was only one with 3 cookies.

Next, I put this up on the board, and asked "Which One Doesn't Belong?"

Almost instantly someone said "They grey one," but right away someone else argues "It could be the hexagon too," and the discussion begins. I have the students explain to me why each one of the shapes doesn't belong, and when their logic was flawed, another student was pointing it out before I had to. The obtuse triangle was the most challenging, but they figured out a reason that they could agree on: exactly one obtuse angle.

To set them up to try this task independently, I had them fold a blank paper into fourths, and asked them to reason why each one of the following doesn’t belong.
They worked on them for a few minutes, and then we took them up together, and I focused on reinforcing the appropriate language eg: increasing, negative, direct, origin, quadrant, intercept, etc. I'm looking forward to using these for our math starter as we move from linear relations into algebra, and then into measurement & geometry.
*Next class I think we will try Desmos' Polygraph:Lines to further build their vocabulary.