The main purpose of this study was to research mathematics teacher candidates' perceptions about the concept of "mathematics" through the use of metaphors. The research is conducted during 2012-2013 academic year, on a group of

In this study, it was aimed to determine the errors and misunderstandings of 5th and 6th grade middle school students in fractions and operations with fractions. For this purpose, the case study model, which is a qualitative research design, was used in the research. In the study, maximum diversity sampling, which is a purposeful sampling method, was used. For this reason, this study was conducted in a state and a private secondary school on a voluntary basis with 105 5th graders and 84 6th graders, with a total of 189 secondary school students from different levels of achievement. In order to determine students' errors and misconceptions about fractions, two tests were prepared by researchers, ten open-ended questions for 5th graders and twelve open-ended questions for 6th graders. Before these tests were formed, the related field was scanned and the existing misunderstandings were determined. Content analysis method was used on the analyzing of the data. The answer papers of the students were coded and students' solving were examined in three categories as correct, wrong and blank. In addition to this the solving belongs to wrong category was examined in detail and mistakes of the students were coded and the reason of these mistakes were dwelled on. It is seen from the result of the study that students have misunderstanding and mistakes about fractions. It is seen that students are not using the modellings on the operations with fractions because of that most of the mistake and misunderstandings are about operations with fractions.

The aim of this research is to determine which concrete materials are used by the mathematics teachers by taking the views of the teachers about the use of concrete teaching materials, what kind of advantages and disadvantages usage of concrete materials have in terms of students, the difficulties experienced during their usage and determining the factors and reasons that disrupt their usage, and also to investigate the self-efficacy perceptions of teachers designing and using concrete teaching materials. For this purpose the research has been carried out with the case study, one of the qualitative research designs. The data of the study was collected from a semi-structured interview form consisting of eleven open-ended questions and based on volunteerism from 100 secondary and 100 high school mathematics teachers. The obtained data was analyzed by content analysis method. As a result of the research, it was determined that the vast majority of participants thought that the use of concrete teaching material in mathematics teaching was necessary. It has been seen that according to teachers, usage of concrete materials concretize abstract concepts, help to discover concepts, provide permanent learning, and facilitate learning. However, it has been found that the teachers face problems such as time loss when concrete teaching materials are used, failure in classroom management, inadequate number of materials, and difficulty in introducing the material to the students. It was also determined that the majority of teachers showed a positive attitude towards using concrete material in their mathematics lessons and that although the self-efficacy was found high, the use of concrete material in the lessons of high school by mathematics teachers was low and the majority of these teachers used geometric objects as teaching material.

The overall aim of this study is to search whether teaching geometry with Cabri Geometry Plus II software have effects on 7th grade students' learning transformation geometry in mathematics. In this context, the researcher has used a pre-test and post-test research design with a control group. The research sample consisted of 135 students in total with random selection method.

Bu araştırmada, matematik dersi öğretim programında vurgulanan “kök değerlere” ortaöğretim 9. sınıf matematik ders kitaplarında ne sıklıkta ve düzeyde yer verildiğinin belirlenmesi amaçlanmıştır. Bu amaç doğrultusunda araştırma nitel araştırma desenlerinden durum çalışması modeli ile yürütülmüştür. Araştırmanın verileri, Milli Eğitim Bakanlığı Talim Terbiye Kurulu Başkanlığınca okutulması kararlaştırılan iki adet ortaöğretim 9. sınıf matematik ders kitabının doküman incelemesi tekniği ile incelenmesinden elde edilmiştir. Araştırmada elde edilen verilerin analizinde betimsel analiz tekniği kullanılmıştır. Verilerin analizinin çerçevesini, ortaöğretim matematik ders programında yer alan on kök değer oluşturmaktadır. Araştırmanın sonucunda ortaöğretim 9. sınıf matematik ders kitaplarında en çok yardımseverlik ve sorumluluk; en az ise sabır, öz denetim, dürüstlük ve sevgi değerlerine yer verildiği belirlenmiştir. Öğrenme alanlarına göre kök değerlerin yer alma sıklıkları incelendiğinde en fazla “Sayılar ve Cebir” en az da “Geometri” öğrenme alanında yer verildiği sonucuna ulaşılmıştır. Son olarak, incelenen ders kitaplarında değerlerin yer alma düzeylerinin daha çok zayıf düzeyde olduğu tespit edilmiştir.