I am a primary school math teacher. With my teaching experience, it is very important for children to make up and break down their backs when they are in large classes. Children can learn nothing else as long as they memorize the composition and decomposition within 10. Teachers can teach first-grade children, but calculation is the foundation. If you don't recite the composition and decomposition within 10, you will have some difficulties in speed and accuracy in future study, because parents seem to have learned some knowledge points in the first grade, but in fact they are overdone, teacher. I suggest that during the children's holiday, parents must let their children recite the composition and decomposition within 10, which will greatly help and improve the new knowledge after learning.