Video 1: Making the Case: Mathematical Argumentation
Produced by WGBH Education on 2014. 6. 18.
This video from the Making the Case: Teaching Mathematical Argumentation collection introduces Common Core Standard #3 for Mathematical Practice: “Construct viable arguments and critique the reasoning of others,” and provides context about implementing the standard in your classroom practice. Reflections from teachers and from math education experts are also included.
https://www.youtube.com/watch?v=pVdH91NkEzM
Video 2: 7 into 28 by Abbott & Costello
https://www.youtube.com/watch?v=MS2aEfbEi7s