The purposes of this study are to investigate Turkish pre-service middle school mathematics teachers' ability in conducting valid proofs for statements regarding numbers and algebra in terms of their year of enrollment in a teacher education program, to determine the proof methods used in their valid proofs, and to examine the reasons for their invalid arguments. A proof questionnaire containing three proof statements was administered to 115 pre-service middle school mathematics teachers in a large state university in Ankara, Turkey. The results showed that more than half of the pre-service teachers were able to conduct valid proofs for the given statements. In terms of year levels, it was seen that the seniors were the least successful group in conducting valid proofs for each statement. When pre-service teachers' valid proofs were analyzed, it was concluded that mathematical induction and direct proof were the mostly used methods for the given statements. When pre-service teachers' invalid arguments were analyzed, it was seen that "inserting numbers to verify the given statement" and "rewriting the givens in the statement" were the common reasons for stating invalid arguments.
Bu çalışmanın amacı, ilköğretim matematik öğretmen adaylarının teknolojik pedagojik alan bilgilerinin (TPAB), TPAB öz güvenlerinin ve teknoloji kullanımına ilişkin algılarının gelişimini incelemektir. Bu amaç doğrultusunda, ilköğretim matematik öğretmenliği programı son sınıfında öğrenim gören öğretmen adaylarına haftada üç saatlik "Bilgisayar Destekli Matematik Öğretimi" dersi kapsamında bir öğretim programı uygulanmıştır. Matematik eğitiminde kullanılan dinamik geometri yazılımlarından Cabri 2D ve 3D, GeoGebra, GSP ve Drive programlarının matematik eğitiminde nasıl kullanılması gerektiği öğretmen adaylarına araştırmacılar tarafından anlatılmıştır. Çalışmanın amaçları doğrultusunda Teknolojik Pedagojik Alan Bilgisi Ölçeği, Teknolojik Pedagojik Alan Bilgisi Öz güven Ölçeği, Teknoloji Kullanıma Yönelik Algı Ölçeği araştırmanın başında ve sonunda 30 öğretmen adayına uygulanmıştır. Ölçeklerden elde edilen veriler nitel ve nicel olarak analiz edilmiştir. Uygulanan öğretim programının öğretmen adaylarının teknolojik pedagojik alan bilgilerinde ve özgüvenlerinde olumlu yönde gelişme olurken teknoloji kullanımına ilişkin algılarında değişim olmadığı sonucuna ulaşılmıştır.
This study aims to examine how being involved in an argumentation process relates to the formal proof process in geometry. Prospective mathematics teachers were involved in an argumentation process while producing conjectures before engaging in formal proof of the recently produced conjectures. To collect data, four geometry-proof tasks that involve two sections were employed. The first section of the tasks demands the production of conjectures, which stands for the term argumentation. The second section asks for the formal proof of one of the recently produced conjectures. Based on the data analysis, the affordances of being involved in argumentation before engaging in the formal proof process were listed as positive affective occasions, arrangement of knowledge related to the content of the task, visual aspect, and the veracity of the statement. Negative affective occasions and confusion related to the difference between conjecturing and proving were coded as constraints of being involved in argumentation before formal proof.
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