Chinese and Russian pupils participate in an abacus competition in Vladivostok, Russia, July 19, 2025. The "Pacific Cup 2025" International Mental Arithmetic Olympiad was held Saturday in Russia's Far Eastern city of Vladivostok. The competition, organized by Russia's Eastern Association of Mental Arithmetic, brought together 123 primary school students from Russia and China. (Photo by Guo Feizhou/Xinhua)
Chinese and Russian pupils participate in an abacus competition in Vladivostok, Russia, July 19, 2025. The "Pacific Cup 2025" International Mental Arithmetic Olympiad was held Saturday in Russia's Far Eastern city of Vladivostok. The competition, organized by Russia's Eastern Association of Mental Arithmetic, brought together 123 primary school students from Russia and China. (Photo by Guo Feizhou/Xinhua)
A Russian boy participates in an abacus competition in Vladivostok, Russia, July 19, 2025. The "Pacific Cup 2025" International Mental Arithmetic Olympiad was held Saturday in Russia's Far Eastern city of Vladivostok. The competition, organized by Russia's Eastern Association of Mental Arithmetic, brought together 123 primary school students from Russia and China. (Photo by Guo Feizhou/Xinhua)
Chinese and Russian pupils participate in an abacus competition in Vladivostok, Russia, July 19, 2025. The "Pacific Cup 2025" International Mental Arithmetic Olympiad was held Saturday in Russia's Far Eastern city of Vladivostok. The competition, organized by Russia's Eastern Association of Mental Arithmetic, brought together 123 primary school students from Russia and China. (Photo by Guo Feizhou/Xinhua)
A Chinese girl participates in an abacus competition in Vladivostok, Russia, July 19, 2025. The "Pacific Cup 2025" International Mental Arithmetic Olympiad was held Saturday in Russia's Far Eastern city of Vladivostok. The competition, organized by Russia's Eastern Association of Mental Arithmetic, brought together 123 primary school students from Russia and China. (Photo by Guo Feizhou/Xinhua)
