Representations of Relations

This is going to be my fifth year teaching Algebra 2, this year I am changing schools so it will be called Advanced Algebra. I was doing some curriculum writing with my new team of teachers and the first section we are going to cover as a class is Representing Relations my first reaction was...



At this point with just coming back to school students may not remember what relations are, what functions are, or domain and range.

I thought back to Dan Meyer's talk of headaches and aspirin and why do students need to know there are different ways to represent relations: ordered pairs, tables, graphs, and mapping.

I took the second graph from New York Times: What's Going on in this Graph?  and re-organized the information differently.

Give the students the following information:
This data is organized from by: country (guns per 100 people , mass shooters per 100 million people).
United States (85, 28)
Canada (26, 9)
Afghanistan (2, 20)
Iraq (37, 4)
France (35, 15)
Yemen (55, 40)

Ask the students what they notice? what do they wonder? As the teacher write down everything they say. One question I have is what is the data saying? Is there a different way to represent the data?

Give the students the following information:



What do they notice and wonder now? What has changed? You can show them mapping as well, but eventually you will need to introduce other things, but the last one is the graph from The New York Times.




How do the three representations differ, do they all tell the same story? Do some tell the story better? I'm not sure if this is the way to start the year out, but nothing is perfect. I want students to feel that there is some context to mathematics other than its day 1 therefore we do lesson 1.

Lines of Ballerina Dancers

At the Joslyn Art Museums Thursdays for Teachers we got the chance to sketch 4 ballerinas from the Nebraska Ballet Company. Our workshop first focused on the lines of a ballerina dancer in different poses. It got me thinking about the different lines of a ballerina and in Algebra 2 we are currently going over linear equations. What linear equations do a ballerina make? So I put the pictures in Desmos and this is what I found.

Here are three lines I found.

After I graphed these I thought what a great activity this would be for students. Students could do their own poses and graph them, they could be shooting a basketball, yoga poses, or football poses. 

Then I thought what if we did this every unit and students could reflect on line families and how they relate.  It is one of my big goals I want to student to learn this year: Function families share similar graphs, behaviors, and properties.

Then I tried the same graph with parabolas, which is our next unit. Almost seemed to work better.

Debates in Math

I have been looking over my Algebra 2 curriculum to find places where I could include debates in the math classroom.  I was trying to find ways of including more formal debates where students take in all of the information.  My goal is to give students a day to find all of the information, that night have them make a poster, meme, or infographic to demonstrate that learning.  The next day students will present their arguments to the class in a fishbowl activity.

1. The first would be about Functions, Equations, and Graphs.  Students would be split into groups of 2 and one would be graphs the other would be equations.  Students would have debate on which is a better demonstration of functions equations or graphs.
• Students would then have to produce a poster or meme.
• Then the next day students would argue about which is better.  A list of questions that I will pose to students to get them talking will be added later.
2. The second debate would be about Quadratic Functions and Equations. Same concept on groups of two but it would it include the best way to solve quadratics.
• This time students will be placed into groups:
• Completing the Square
• Quadratic Formula
• Graphing
3. The last one I will incorporate is probability.  I'm going to go a little off script and give them an article to read and then talk about analyzing data.  Is the article true or not students will have to determine if the samples and survey are sound. 

I will add more as I become more proficient in dealing with debates and keep you posted as we have them in class.