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The purpose of this study is to investigate the number sense performance of secondary school students according to grade level, gender and the components of number sense. A descriptive survey design was used to collect data. A total of 576 secondary school students (291 girls and 285 boys) participated in the study. The results revealed that the number sense performance of secondary school students was very low for each grade level. Among the components of number sense, the lowest mean score was observed in multiple representations. Moreover, the number sense performance scores of the students differed significantly in terms of their grade level, though no significant difference was found according to gender. The investigation concluded that the number sense performance of secondary school students is not satisfactory and needs to be improved.

This study aimed to investigate the changes in teacher perceptions regarding the use of technology subsequent to the training about technology integration in mathematics teaching. A training program that included combined technology, pedagogy and content knowledge was prepared and implemented on pre-service teachers with this aim. Exploratory sequential mixed method, one of the mixed method designs that include qualitative and quantitative research techniques, was utilized in the study. While pretest-posttest experimental design with no control groups was used in the quantitative dimension of research, pre-service teachers' written views were collected during the qualitative part of the study. Study participants were 34 pre-service teachers attending Middle School Mathematics Teaching Department of a state university during the spring semester of 2013-2014 academic year. Perception Scale for Technology Use and interview forms were used as data collection tools. Descriptive statistical methods and t-test were utilized for analyzing quantitative data whereas content analysis was preferred for qualitative data. Research results presented that significant differences were identified in middle school mathematics pre-service teachers' perceptions regarding the use of technology as a result of the training related to technology integration in mathematics teaching. Based on the findings, it was concluded that trainings that incorporate technological, pedagogical and content knowledge that are provided during teacher training process develop pre-service teachers' perceptions related to the use of technology in mathematics teaching.

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This study examines prospective teachers beliefs in their own abilities and effectiveness to impart mathematical literacy to their students, their beliefs about mathematical problem solving, and the relationship between these two belief systems. A total of 567 prospective teachers, majoring in mathematics, science and elementary teacher education programs volunteered to participate in the study. The Self-Efficacy Beliefs Scale about Mathematical Literacy and the Beliefs about Mathematical Problem solving instruments were administered to prospective teachers. Results of the study revealed that there was a significant relationship between the beliefs about mathematical problem solving and self-efficacy. Findings of this study indicated that prospective teachers beliefs about mathematical literacy were an important predictor on the beliefs about mathematical problem solving.