Mathematically, things with the same nature are called sets. For example, if you take five apples from a fruit and put them together, these five apples are a group. When we count to three and four, we know the number of similar elements in a group. A scholar once did an experiment: simply train children to count, and a month later found that this training did not play a role in the formation and development of the concept of numbers. ?

Guide children to classify.

The classification of classified articles introduces the concept of "collection" well. There are many classification activities in life. Children can classify the surrounding objects according to different characteristics and attributes, and put them into different sets. For example, according to the external characteristics of the object, such as color, shape and so on. Classify objects according to their size, length, thickness, thickness and weight. According to the purpose of the article, such as putting crayons, drawing paper and hand scissors together, these are all school supplies. Put towels, toothbrushes, hand sanitizers and all cleaning supplies together.

Classify things according to their relationships, such as putting rabbits and carrots together and monkeys and bananas together in a pile of animals and food. For the classified education of older preschool children, we can learn to classify according to "two-dimensional characteristics", that is, classify things according to two characteristics at the same time. The basic process of thinking analysis, comparison, observation and judgment involved in classification activities also has a certain influence on cultivating and improving children's logical thinking ability. Parents can take their children to play these games: put candy of different colors, shapes and sizes, and let the children try to classify the candy. Ask the children to circle or put objects with the same name together and name them. ?

Teach children to correspond to things correctly.

Let the children name the collectibles in various life situations, such as clothes brought from grandma's house, snacks grandma likes, and things mom bought. Prepare a multi-layer shelf, and let the children classify it according to picture books, small toys and food, and put it on each layer of the shelf. Let the children put their clothes and socks in order and sort them. Correspondence between two sets means that the elements of one set are mapped to the elements of another set according to a certain correspondence, and the correspondence is not calculated. There are various correspondences in life: correspondence of quantity, correspondence of form and shape, correspondence of thing and position, and so on. Correspondence is the perceptual basis for children to learn to count. Because the counting process starts with 1 to establish the corresponding relationship between the elements in the number set and the natural number set.

For example, counting a row of small chairs means counting small chairs from 1, and the last number is the total number of small chairs in this row. Correspondence can be used for statistics and comparison, such as comparing the number of small chairs and children, as long as each child sits in a small chair.