> Many stars are mathematical stars, which are interesting to calculate. < br > Activity arrangement: oral calculation, pen calculation, oral calculation multiplication, pen calculation multiplication, area calculation of rectangle and square, addition and subtraction of pen decimal, problem solving, etc. Br Through community activities, students can further experience the application value of mathematics, further stimulate students' interest in learning mathematics, understand the value of mathematics, cultivate students' good habits, develop students' personality, improve their comprehensive quality, promote their all-round development and show their mathematical talents.