G.1 Logic- Valid Forms of Deductive Reasoning

Lesson-

Begin by describing and giving examples of each valid form of deductive reasoning including the law of syllogism, law of detachment, and the law of contrapositive.  Use pages 5-6 from the VDOE's G.1 Deductive Reasoning Mathematical Instructional Plan to help with examples and practice.

Whole group practice-

Use this Google slides presentation.  Students must determine which law is represented, if any.  I would project each slide on my board and have students answer on individual white boards.  Discuss common errors and misconceptions after each problem is answered.

Individual Practice-

Students complete this 10-question Quizizz on the Laws of Deductive Reasoning.  I would assign it as a "homework" so that students can complete it at their own pace.  Questions include determining which law of logic is being used and determining a valid conclusion.