TME(2021) Vol 2, No. 2, pp 76-85

Twelve Erroneous Proofs

TOH Pee Choon

National Institute of Education
Nanyang Technological University

Published in The Mathematician Educator, 2021, Vol 2, No. 2, pp 76-85.


Assessing how well students understand proofs is difficult. One way to achieve this is to present an erroneous proof and require students to identify the error. Twelve erroneous proofs on various topics in mathematics at the Secondary school level are presented as examples.

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