The child has just entered primary school, and his calculation ability is very poor, especially his mental arithmetic speed is too slow. What should I do? I want to give him a class, but what training class is suitable? Which is better to learn mental arithmetic? There are many training schools doing mental arithmetic now. I am a teacher personally. Through comparative study, I found that mental arithmetic is very helpful to the development of children's left and right brains. It can not only train children's hand-eye coordination ability, but also enable children to learn mental arithmetic quickly and enhance their self-confidence. It's really good. There is a branch in Wuchang, Hankou. You can try it.