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This study examined the relationship between online class environments and the economic burden and mental health among university students at the onset of the COVID-19 pandemic. The survey participants were 909 undergraduate students, and graduate students in Hokkaido who responded to the first wave of the two-wave panel survey. The survey was conducted from July to September 2020. This study used K6 and GAD-7 as indicators of mental health. The results showed that students with both a high economic burden and a high burden of on-demand online classes after the onset of the COVID-19 pandemic had a high probability of exceeding the cutoff points (indicating severe depression and anxiety) for K6 (above 13 points) and GAD-7 (above 10 points). The number of live online classes predicted lower depression. The discussion focused on the characteristics of online classes and discussed why they were associated with mental health and how to reduce the sense of burden in classes. In addition, we pointed out the importance of economic support for university students, since economic burdens were related to mental health.

The aim of the current study was to investigate the relationship between school bullying and inter-peer group status among Japanese middle-school students. A total of 2294, 7th–9th grade Japanese middle-school students participated in this study. Using a self-report questionnaire, we measured their inter- and intra-peer group status, bullying behavior, victimization, coping strategy, and current victimization status. The results showed that, compared to those in the higher-status groups, students in lower-status peer groups tended to be bullied and experienced prolonged victimization. These findings suggest that a lower peer-group status predisposes students to victimization.

Understanding of base-10 concept and its application: A cross-cultural comparison between Japan and SingaporeIt has become increasingly clear that the early use of decomposition for addition is associated with later mathematical achievement. This study examined how younger children execute a base-10 decomposition strategy to solve complex arithmetic (e.g., two-digit addition). 24 addition problems in two modalities (WA:Written Arithmetic; OA: Oral Arithmetic) with sums less than 100 were administered to 22 Japanese and 22 Singaporean 6-year-old kindergarteners. Our findings reveal that they were able to solve complex addition. For instance, Japanese kindergarteners tended to solve complex arithmetic using base-10 decomposition across the modality, whereas Singaporean kindergarteners used standard algorithms and basic counting to solve complex WA and OA problems, respectively. We speculate that Japanese kindergarteners might have a clearer understanding of the base-10 concept and were able to use this knowledge more readily than Singaporean kindergarteners. Mathematical experiences in kindergarten and number-naming systems have been put forward as two of the crucial contributors for such cross-cultural differences. This study also provides new directions for future research on the understanding of the base-10 concept and its application among young children.