I like Tiananmen Square in Beijing. One * * * is seven words. Mathematically, 30 ÷ 7 = 4+2, which means I wrote "I love Tiananmen Square in Beijing" four times. The fifth time was written from the 29th, so the 30th word is "love".

Doing math challenges can make students who are interested in math and have spare capacity in class get in touch with some principles and theories in advanced mathematics in advance, cultivate their ability to use basic knowledge flexibly and teach more problem-solving skills. Math challenges can develop children's thinking, but learning Olympiad is not suitable for all children. Failure to learn the Olympic Mathematics well does not mean that students cannot become talents, and "talent" cannot be simply understood as mathematics and physics talent. Children who are gifted and interested in mathematics may be more interested in mathematics after studying Olympic Mathematics. For students who are not interested in mathematics and lack talent, too much Olympic math training may make them feel tired of learning and hinder students from learning mathematics knowledge.