Herplunk™: A Game of Proofs is a fun in-class group activity that develops logical thinking skills in high school mathematics students, and is an excellent introduction to standard CCSS.MATH.CONTENT.HSG.CO.C.9.
Herplunk™ consists of 3 scaffolded levels of play (two nonsensical levels involving imaginary animals with silly theorems and definitions, and one geometric level in which students prove that vertical angles are congruent), and gives students an opportunity to order cards containing theorems, axioms, definitions, and other statements to form a flowchart-style proof.
Herplunk™ can be used as a 1-, 2-, or 3-day activity, with each level of play taking anywhere from 10 to 45 minutes, depending on the level of play and how the deep the teacher encourages students to go in the activity.
Also included in the download are instructions for preparing the activity for the classroom and instructions for playing the game, a teacher demo to help provide an introduction for students, and possible solutions for each level.
48-page download includes:
1 instruction page
7-card teacher demo with solutions and sample proof write-up
9-card Level 1 with solution
10-card Level 2 with solution
16-card Level 3 with solution