This paper presents findings from an extensive study conducted in Brazil. The main subjects of the study were Bulgarian children living and studying in Brazilian schools. The main goal was to indicate what kind of problems and obstacles they experience during the school time in Brazil and how the Brazilian government and people support these Bulgarian children. The data was collected by a Bulgarian research team that travelled to the remote regions of Brazil where many Bulgarian citizens live and work. The researchers took interviews with the Bulgarian children and their parents as well as school staff at the schools in Brazil with a high population of Bulgarian children. The analysis revealed many different problems that Bulgarian children and their parents highlighted, such as problems with the language of instructions, misunderstandings of school rules and general problems related to living in the remote areas of Brazil, such as weather and heat-related issues. Although many Bulgarian families reported some problems, they were still determined to continue their life and career in Brazil, and they want to continue to pursue their dreams.

This study investigates school-age children’s arithmetic operations performance while solving larger-size problems which produces interferences in memory. Complex problems can trigger competing responses in working memory, which are irrelevant to a task goal and increase the likelihood of interference from previously learned problems (De Visscher et al., 2018). Interference control in working memory is required to be able to manage and suppress irrelevant information while performing cognitive tasks such as arithmetic problem-solving (Unsworth, 2010). The present study explores potential cognitive processes while performing arithmetic tasks and emphasizes the important role of interference control for better performance in such tasks. This study applied a mixed-effect model experimental design. Forty-four primary school children were involved in the study. The results showed that children’s performance in terms of correct responses was similar for both small-size and large-size problems. However, their response speed was significantly lower in larger-size problems, which created more interference in working memory.