"Huajin Cup" Junior Mathematics Invitational Tournament (hereinafter referred to as "Huajin Cup") is a mathematics competition named after China. It was created in memory of Hua, a famous mathematician in China. It is a national large-scale juvenile mathematics competition, which has been held for 20 times. \x0d\ China Cup is divided into primary school group (not higher than grade four), senior school group (not higher than grade six) and middle school group. The purpose of \x0d\ China Cup "is to educate young people to learn and carry forward Professor Hua's patriotism, hard-working quality and the spirit of loving science. Stimulate primary and secondary school students' interest in learning mathematics, develop their intelligence and popularize mathematical science. \x0d "China Cup" has been successfully held for 20 times, with more than 100 cities and more than 40 million children participating in the competition. "China Cup" has become the driving force to educate and inspire generations of young people to climb the scientific peak and make progress, and is deeply loved by students, teachers and parents. Japan, South Korea, Malaysia, Singapore, Mongolia and other countries, as well as Hongkong, Macau and Taiwan Province Province also sent teams to participate in the competition. \x0d "China Cup" has always adhered to the proposition principle of combining universality, interest and novelty. The competition system is once a year and the finals are held every two years. \x0d\ schedule \x0d\ preliminaries: mid-late March 19 \x0d\ finals: mid-April 16 \x0d\ finals: July to August.