35b52a70_State_Standards___Project_SEED__Examples_in_SEED_Lessons
[Mathematical Practices] 3. Construct viable arguments and critique the reasoning of others [Examples in SEED Lessons] 
In Project SEED lessons students have frequent opportunities to communicate with each other about their reasoning and why they agree or disagree with their classmates ideas. They work at convincing their classmates that their own method works. Hand signals for agreement and disagreement help create a classroom atmosphere of respectful dialogue.
Project SEED and Common Core State Standards | Project SEED
Examples in SEED Lessons