The core experience of large-class children's mathematics is mainly reflected in laying the foundation for the connection between young and old. Every parent is very concerned about whether their children can keep up with primary school, especially math. Therefore, special attention is paid to the mathematics teaching of large class children, which is also transmitted to the mathematics teachers, asking them to prepare for the connection between the old and the young. Mathematics needs higher logical thinking ability and spatial imagination ability. Although children's skills are not as complicated as those of senior students, we can try to cultivate them in this respect. The usual teaching consciously uses some intuitive teaching AIDS to cultivate children's practical ability and imagination.