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Two Truths & a Lie: Rational Functions

Twitter is an awesome resource for teachers. There is so much information - I get a little overwhelmed at times. 

 However, while browsing the feeds one day, I came across a post about two truths and a lie on Desmos by Dan Meyer. Immediately, I was intrigued. In AP Calculus, I have my class do a TTL gallery walk, but one on Desmos…WOW! Here is Dan Meyer's Blog where he talks about all of his TTL activities. If you have any requests, just leave him a comment.


In PC, my colleague and I are teaching our functions unit. How perfect - Dan has a rational functions TTL activity. Since this was our first one, we didn't know what to expect. However, it was easy and went really well. 

Students start by making a challenge and create a rational function. The next screen allows students to generate two truths and a lie.

Once students move through the challenge, they are asked which statement is a lie and must give a written explanation of why. (I love when students must explain their math!) When students are finished creating their challenge, the class gallery appears. Students can choose from the list of challenges and start guessing!!! 


Even though some of our students were completely wrong when creating their truths and lie, :( the students started having great conversations about why they had two lies instead of one. :) This was an excellent learning moment! We will definitely try a TTL activity again! 


~RJ & SSB 



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