Decimal multiplication and division operations; Four operations of fractions.

Key points of calculation in lower grades-skills of integer addition, subtraction, multiplication and division.

High school math problems can no longer be solved naively from left to right or in order.

The operation skill of senior students is actually to rearrange the order of combination operation. All operating skills must be based on operating rules. Fourth grade is a new starting point!

In the fifth grade, the operation is more difficult! The multiplication and division of decimals is far more than the multiplication and division of decimals: the change of multiples and the change of product quotient; Use of rounding; The movement of decimal point and the change of product quotient must be thoroughly understood and applied to calculation. So the fifth grade is a big obstacle.

The second difficulty is the basis of number theory.

As soon as I learned the multiplication and division of decimals, I couldn't even figure out how to calculate them. I immediately came up with a bunch of numbers: factor, multiple, odd number, even number, common factor, common multiple, prime number and composite number. Every concept with "x number" is extremely abstract.

If the child understands, that's ok. In case some concepts of two numbers are unclear, it is easy to shrink back.

We usually have this feeling in our life: if we communicate with others, the meaning of a sentence is beyond our understanding, and we can easily ignore it; We'd rather have others repeat it several times. But children may not have this sense of learning.

Theoretically abstract, this will be a hurdle that children need to face.

Difficulty 3, graphic basis

Polygons and three-dimensional graphics are coming!

Graphics is a research way to make mathematics more active.

One of the key points in the first volume of grade five is the area of polygon.

The forward and backward application of the formula is complicated and interrelated, with many problems.

From the area of a single figure to the combination of various figures, the cutting, cutting, filling, spelling and grouping of areas are mysterious everywhere.

One of the key points in the second volume of grade five is cuboid and cube.

The study of the shape, surface area and volume of objects makes mathematics closer to life.

The contents of the first volume and the second volume of the fifth grade, at the time point, are so coincidental that they are all in the semester, and a large number of formulas need to be memorized: side length, surface area, volume and so on.

Surface area, volume, drainage method and constant volume deformation are closely related to life, which tests children's understanding of common sense of life.

This is why graphics will become a popular test center for junior high school students!

Difficulty 4, the score really determines your score!

Basic understanding, conversion, total score, addition, subtraction, multiplication and division of scores.

Since then, there have been two kinds of numbers in the application problems of grade five: quantity and score. However, these two basic concepts are the dividing line between grades 5 and 6.

If you learn well, you feel very simple; I find it difficult to learn badly.

How to do 1: lifting calculation

It is necessary to improve the skills of decimal operation and decimal operation, and improve proficiency and accuracy.

The way of oral arithmetic training is essential.

How to do 2: improve your exam skills.

In other words, let children develop the ability to organize information.

Sorting, decomposing and digesting are always more important than understanding. Through reading through the questions, from the initial perception of the size, multiple, equality or difference of quantity to the in-depth thinking of the quantitative relationship between A, B and C, these seemingly useless and tedious training methods are the key to cultivating meticulous logic in the future!

This way of combing application problems includes the cultivation of habits such as circling keywords, drawing line segments and sketching.