As for abacus mental arithmetic, you have to learn what it does. If it's just for calculation, don't learn at all. Of course, there are also many people who can't say it well. Moreover, his calculation process is done in his mind, so others can't see it, so many people, especially primary school teachers, say it's not good because they have to teach children to calculate. As a result, as soon as the topic was written, the students called the results below. What did you say?/Sorry? But if you look at it from the child's point of view: write or read a string of numbers, the child can quickly give the answer, indicating that the child has quick reaction, concentration, strong computing ability and good observation. If a child has strong computing ability, he will have a sense of superiority in the eyes of his classmates, and he will have confidence. Then with self-confidence, children will have confidence in learning other subjects. This is called positive migration.
Abacus mental arithmetic is mainly to train children's right brain, enhance their memory and improve their thinking ability in images. Easy to learn, suitable for every school-age child to learn. Olympiad is to train children's logical reasoning ability, which is only suitable for students with flexible minds and good math scores. If students don't do well in math, it will increase their study pressure. Therefore, it is not recommended for young children and children with poor math scores to learn.