1, the basic property of the fraction: the numerator and denominator of the fraction are multiplied or divided by the same number at the same time (except 0), and the size of the fraction remains unchanged.

2. Degrade: Turn a score into an equal score, but the numerator and denominator are smaller. When a date is made, it is usually in the simplest score. (The numerator and denominator have only one common factor 1, and such a fraction is called the simplest fraction) Simplification method: directly divide by the greatest common factor of the numerator and denominator.

3. Comprehensive score: It is called comprehensive score to change several scores with different denominators (also called different denominators) into scores with the same denominator equal to the original score. In the general division process, the same denominator is called the common denominator of these fractions. Generally speaking, the least common multiple of the original denominator is used as the common denominator.

4. Comparison method of scores with different denominators: first, convert the total score into scores with the same mother, then compare, convert it into decimals, and then compare.

The skills of fifth-grade students to learn math well are as follows:

First, preview.

Does not mean browsing. It is necessary to deeply understand the content of knowledge, find out the key points, difficulties and doubts, and mark the places you don't understand after thinking, which is conducive to grasping the key points in class, cultivating self-study ability and having time to study in advance.

Second, listen.

The core lies in the classroom: giving priority to listening, giving consideration to records, paying attention to the process, ignoring the conclusion, paying attention to the main points and improving listening efficiency.

Third, review.

Review class notes like watching a movie, organize your notes,

Fourth, do more exercises.

It is best to do a math problem when you sit at your desk and watch math after dinner in the evening. Every step should ask more individual reasons, not just be satisfied with the teacher's indoctrination in class and the simple narrative in the book. If you want to improve, you must push and think step by step. Every working procedure is essential.