Due to the varied social inequities, the pandemic has prompted unprecedented attention to the social divides in learning gains via online/blended learning. It has been identified that approximately 27,000 Chinese cross-border students live on the Mainland but attend Hong Kong schools every day. The pandemic has restricted the passage of the Shenzhen-Hong Kong border, and these students suffer greatly as they may still be forced to attend online lessons at home for over two years, even if schools return to face-to-face teaching. This study is a 2-year longitudinal case study with a purposeful sampling of a primary school that has over 70% of Chinese cross-border students. A mixed-methods approach was adopted to examine students' online learning experiences via teachers' interviews. Regarding their learning challenges, 35 students were invited to complete a 5-point Online Self-regulated Learning Questionnaire (OSLQ) and an open-ended opinion survey, which was then triangulated with teachers' feedback. First, this study has identified three major challenges that cross-border students suffer the most in online learning: self-regulation strategies, technical challenges, and social interaction. Second, several teaching strategies have been found to offer additional support (e.g., after-school classes and learning centers in Shenzhen) for cross-border students to sustain their online learning and alleviate their learning challenges. Based on these findings, this study contributes to documenting the learning challenges for cross-border students during the pandemic, which provides insights for other schools to facilitate cross-border education and develop appropriate online learning strategies for cross-border students. Copyright © 2023 International Forum of Educational Technology & Society.

We presented a design-based study within the context of a four-session Scratch programming activity among 23 fourth-grade students in Hong Kong. Inspired by the computational thinking (CT) strategies and the 5E instructional model, we investigated students’ mathematical learning of fractions in a Scratch (block-based programming) environment. Students developed CT concepts, practices, and perspectives by building a “fraction magic calculator” in groups. This study analyzed the lesson design, students’ drawings, interviews, and work expressing their mathematical understanding of fractions in Scratch applications. The learning tasks were designed to support the students’ fraction learning and utilized computational abstractions in the form of variables, functions, and iterations to formulate mathematical models in a programming context. Students’ artifacts and feedback showed they were interested in learning fractions in a programming learning context, contributing to exercising and improving their fraction concepts and CT. Ultimately, we emphasized the benefits of CT integrated into mathematics education, promoting students’ understanding of fraction concepts, a set of CT abilities (concepts, practices, perspectives), and learning motivation. Moreover, we suggested a set of non-cognitive skills (e.g., socializing, expressing) to enrich the CT perspectives in the framework and show the importance of developing coding communities to co-create digital artifacts among learners. Overall, we highlighted that mathematics teachers should apply and create learning tasks that promote computational thinking to forge mathematical ideas and thinking. Copyright © 2023 The Author(s).