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Cirillo, Michelle; Griffin, Casey; Seiwell, Amanda; Hummer, Jenifer – North American Chapter of the International Group for the Psychology of Mathematics Education, 2021
We report findings from an investigation of one teacher's instruction as he guided students through the proofs of 21 theorems in a Grade 8 Honors Geometry course. We describe a routine involving four distinct phases, including Setting up the Proof and Concluding the Proof. Results from an end-of-course proof test are also presented to attest to…
Descriptors: Geometry, Mathematical Logic, Secondary School Students, Mathematics Instruction