Construct viable arguments and critique the reasoning of others.

Mathematically proficient students can...
  • Use observations and prior knowledge (stated assumptions, definitions, and previous established results) to make conjectures and construct arguments.
  • Compare and contrast logical arguments and identify which ones make the most sense.
  • Justify (orally and in written form) the approach used, including how it fits in the context from which the data arose.
  • Listen, understand, analyze, and respond to the arguments of others.
  • Identify and explain both correct and flawed logic.
  • Recognize and use counterexamples to refine assumptions or definitions and dispute or disprove an argument.


To see what this standard could look like in a classroom and get resources to help you do it in your classroom click on the following links:

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