I. Elaboration of core experience

The so-called quantity refers to all the properties of objects or phenomena in the objective world that can be qualitatively distinguished or measured, which can generally be divided into continuous quantity and discontinuous quantity. Discontinuity, also called separation quantity, is a quantity that represents the number of elements in an object. The continuous quantity, also called correlation quantity, represents the properties of an object, such as length, area, volume and so on.

The so-called comparison refers to the relationship between two or two groups of objects according to a certain characteristic or attribute. It is one of the most commonly used methods in children's mathematics learning, and it is also the most basic process of individual thinking.

The comparison of quantity includes the comparison of discontinuous quantity and continuous quantity. The comparison of discontinuous points is the comparison of the number of two groups of elements, which are generally compared by overlapping, juxtaposition and connection. The quantitative comparison is usually discussed in the category of "the concept of number". The comparison of continuous quantities refers to the comparison of the size, length, thickness, height, thickness, width, weight, distance, speed and so on of object attributes. In preschool period, what children say about cognition and comparison is usually a common continuous quantity in the above-mentioned life.

Second, the core experience point

1. Determining attributes is an important prerequisite for quantity comparison.

2. Language can be used to identify and describe specific attributes.

3. The comparison of quantity is relative and transitive.

Third, the development track and characteristics of children

1. From obvious difference to insignificant difference

2. From absolute to relative

3. From non-conservation to conservation

4. From vagueness and imprecision to gradual accuracy

Fourth, support wake-up strategies and activity prompts.

1. Use multiple senses to perceive and compare the number of objects.

Visual comparison, tactile comparison and application perception comparison. In activity design activities, teachers first pay attention to finding the attribute dimension of quantitative comparison, and then think about relativity and different attribute dimension characteristics and what means and materials are more conducive to children's comparison.

2. Compare the life scenes and experience the differences.

With the help of the familiar life scenes of children

Adopt the form of gamification operation activities.

Create an open and independent learning atmosphere.

Based on the situation, pay attention to the combination of knowledge and experience

A comparison of the differences in the number of verbs (abbreviation of verb)

In the comparison of quantity differences, it is very important to help children perceive and experience the conservation of quantity. Limited by age and abstract development of thinking, children are often easily interfered by external forms and visual judgments in the comparison of quantity, so they can't correctly understand the quantity of objects. In the design of teaching activities, teachers should highlight the following points.

① Change the schema to help children perceive the conservation of experience, that is, use variants to perceive the conservation of experience. (2) with the same amount of two objects for conservation judgment. ③ The conservation of quantity is expressed in the form of number. ④ The idea of the infiltration of the whole and local relations.

In the comparison of quantity differences, teachers should also pay special attention to clearly distinguish the difference between quantity sorting and way sorting. Sorting means sorting two or more objects according to certain differences in characteristics or certain rules. Sorting is a kind of thinking activity based on comparison, and it is an important activity to reflect the development of children's thinking judgment and reasoning ability. In the pre-school stage, sorting activity is an operational activity that runs through the teaching contents of pre-school children, such as the concept of number, the understanding and comparison of number order, and the identification and distinction of the characteristics of quantity difference. General sorting forms can be divided into two types: one is sorting by sequential rules, but sorting by specific rules. The former is mainly related to the sorting of quantity, including sorting according to different objects (from large to small, from long to short, from high to low, from thick to thin, and vice versa) and sorting according to the number of objects (cards sorted by dots from more to less or from less to more). The latter involves pattern ordering, including several different forms, such as specific rule ordering of external characteristics of objects, specific rule ordering according to different number of objects, specific rule ordering according to number of objects and specific rule ordering of object access location.