~Objective:
Lesson: I started right away in groups at the boards. We quickly reviewed the structure of slope-intercept form. I then gave the groups a line in standard form and asked them to turn it into slope-intercept form. When they were done, they were supposed use Desmos to check their equation versus the original equation. (I like to use Desmos as an "answer key" whenever I can to connect the algebra with the graph in a natural way). The first equation was 2x+4y = 8 This first one took a while. Many groups had various strategies and I roamed around and visited with them about their ideas. I chose to consolidate right after this problem because there were a few different strategies and I wanted to discuss the pros and cons of each one. There were also some mistakes that we needed to address as a class. (We found that the most efficient strategy was to move 2x and then divide everything by 4). I had the groups then do a 2-3 more problems:
I next wanted to get the students working more individually while I was around to help. I decided to add a little movement and fun with a snowball fight. (I think I got the original idea from Sarah Carter). I put a large set of equations of lines in standard form on the board and gave each student a piece of paper. They chose one equation and wrote it down. Then they crumpled the paper into a ball, I set a timer for 20 seconds, and they threw the snowballs around until the time ran out. Then they each found a snowball and worked out the problem on it so that it was in slope-intercept form. Again, I had them check their work on Desmos. I would have liked to do another snowball fight, but this brought us to the end of the class period. I used Delta Math for Check Your Understanding problems.
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AuthorI teach mathematics for grades 7-12. Teaching mathematics is my passion. Archives
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