Mathematics teaching is a highly abstract and logical teaching activity, which requires teachers to accurately grasp the attributes of mathematical concepts and express them in mathematical language that children can easily understand. This is very important for children to understand and master mathematical concepts. However, in the teaching process, some teachers often have unclear concepts and misunderstanding. For example, the children in the middle class are classified according to two characteristics, first according to one characteristic and then according to another, and the activity is over. In fact, this activity should also have an activity link that classifies the same batch of objects according to two characteristics. For another example, when teaching children ordinal numbers, because they don't understand the meaning of ordinal numbers indicating the order of elements in a set, there is a fixed relationship between ordinal numbers and objects in the teaching process, which makes children mistakenly think that "rabbits can only live in the fifth room." Such problems are very common in practical teaching.