According to the nature, characteristics and internal relations of memory materials, they are classified to help students remember. For example, after learning the unit of measurement, everything you have learned can be summarized into five categories: length units; Area unit; Volume and unit of volume; Weight unit; Time unit. The first four categories include public, municipal and conversion, and the fifth category includes century, year, month, day, minute, second and its forward speed. This classification can easily systematize, organize and memorize complex things.

(B) homophonic memory method

This memory method is to use the homophony of some memory materials to remember, which makes students impressed and not easy to forget.

(3) Comparative memory method

Some mathematical knowledge is easily confused. We can use the antagonistic relationship of some concepts to grasp the key points in the concepts and compare them, which is helpful for students to distinguish and remember.

(d) Memorizing songs and rhymes

It is to compile the mathematical knowledge to be memorized into songs, formulas or jingles for easy memorization. For example, recite the rules of fractional multiplication and division, and you can compose four songs: "Fractional multiplication and division are very clear, numerator and denominator are multiplied, fractional division is different, and divisor is multiplied in turn." In this way, students can not only remember easily, but also remember firmly.

(5) Understand the mnemonic method

Understanding is an effective and basic memory method. Rich mathematical knowledge is easy to forget by rote, and can only be remembered by in-depth understanding. Therefore, the process of summarizing concepts, properties, drawing rules and deducing formulas must be clear. For example, among all kinds of area formulas, the rectangular area formula is the most basic, and the area formulas of other graphics can be derived from the rectangular area formula. When students understand the process and relationship of derivation, it is easy to remember the area formulas of various figures.

(6) conventional memory method

That is, according to the internal relations of things, find out the regular things to remember. For example, memorizing metric length units, area units, chemical methods, and polymerization methods that reflect units. Chemical method and polymerization method are reciprocal, that is, high unit value × rate: low unit value, low unit value+rate = high unit value. Mastering these two laws will solve the problem of chemical polymerization. Regular memory requires students to process and sort out the relevant materials they have learned with their brains, so the memory is firm.

(7) List memory method

It is to list some confusing memory materials into a table to achieve the purpose of memory. This method is obvious, intuitive and comparative. For example, to remember the differences between the three concepts of prime number, prime factor and coprime number, you can make a table to help students remember.

(8) Key memory method

With the growth of age, students learn more and more mathematical knowledge, so it is a waste of time and a bad memory effect for students to remember comprehensively. Therefore, in order to make students learn to remember the key contents, students can remember other contents through deduction and association on the basis of remembering the key contents. For example, learn the common quantitative relationship: work efficiency × working time = workload. Workload ÷ work efficiency = working hours; Workload+working hours = working efficiency. As long as you remember the first quantitative relationship, you can deduce the last two quantitative relationships according to the multiplication and division relationship. This way of memory reduces students' memory burden and improves memory efficiency.

(9) Associative memory method

It is to remember by thinking about another thing associated with something familiar. For example, from the law of addition and subtraction of integers to the law of addition and subtraction of decimals, from the exchange law and associative law of addition to the exchange law, associative law and distributive law of multiplication. Association can open the floodgate of students' memory and is an effective memory method.

(10) Practice memorization

This is memorized by students' hands-on, brains, experimental operation and summary. For example, students can measure a piece of land and calculate the yield per mu after learning the knowledge about area and land. After learning the knowledge of statistical charts, students can draw statistical tables or charts of their class height and weight. Students will get lasting and unforgettable results through personal practice.