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Excuse me, is Zibo a five-year primary school? What is the content of the second volume of mathematics in grade four?
Zhangdian has long been reformed, and some places have borrowed four aspects of the six-year system: 1. Multiplication.

Whole hundred times two digits, three digits times ten digits, three digits times two digits, and three digits times two digits.

Two. L and ml

Understand the unit conversion of liters and milliliters, liters and milliliters.

● Practical activities: wonderful "cup piano"

Three. triangle

To understand a triangle, the sum of two sides of a triangle is greater than the third side, the classification of triangles, and the sum of internal angles of triangles, isosceles triangles and equilateral triangles.

4. Mixed operation

Three-step calculation problems without brackets, three-step calculation problems with brackets and three-step calculation problems with brackets, and comprehensive formulas for solving practical problems of simple three-step calculation problems.

Verbs (abbreviation for verb) parallelogram and trapezoid

Understanding of parallelogram, trapezoid and isosceles trapezoid.

Operation rules of intransitive verbs

Multiplication distribution law, the application of multiplication distribution law for simple calculation.

● Practical activities: We go for a spring outing.

7. Find a pattern

Explore simple collocation rules and use them for orderly arrangement.

Eight. Symmetry, translation and rotation

The symmetry axis of an axisymmetric figure, draw an axisymmetric figure on the grid paper, translate and rotate the figure, translate or rotate the simple figure 90 degrees on the grid paper, and design the pattern on the grid paper through translation, symmetry and rotation.

● Practical activities: appreciation and design of patterns.

Nine. Multiplication sum factor

The understanding of multiples, factors, odd numbers, even numbers, prime numbers and composite numbers, and the characteristics of multiples of 2, 5 and 3.

10. Explore the law with a calculator

Explore the law of product change, explore the law of quotient invariance, and apply the law of product sum change and quotient invariance to make simple calculations.

XI。 statistics

Simple broken line statistical chart

● Practical activities: Understand our living space.

Twelve. Numbering by letters

Use letters to represent numbers, use letters to represent calculation formulas, and use letters to represent quantitative relations.

Thirteen. Strategies for solving problems

It is used as a graphic method to solve the practical problems of finding distance in travel problems and related practical problems. Has it changed now? I'm not sure.