Knowledge points of fourth grade mathematics
square
Area = square of side length
Perimeter =4. length of a side
Side length = square root of area (the square number that appears now is generally small, which can be calculated by multiplication formula table)
Side length = perimeter /4
Unit of length and unit of area
1 km =1000m
1M = 10DM = 100cm
1DM= 10CM
1 cm =10mm
1 km2 = 1 km2 = 1000000 m2
1 m2 = 100 square decimeter = 10000 square centimeter = 100000 square millimeter.
When the sum of two numbers is constant, when the difference is minimum or equal, the product.
That is to say, the area of a rectangle and a square with equal perimeter (the smaller the difference between the length and width of a rectangle, the larger the area), when the product of two numbers is constant, when the difference is, and.
That is to say, a rectangle and a square have the same area, and the circumference of the rectangle (the greater the length-width difference of the rectangle, the greater the circumference).
Summary of Mathematics Knowledge Points in Grade Four
How to read and write numbers within 100 million?
Census (/kloc-reading and writing numbers within 0/100 million)
Knowledge points:
1 and 1 100 million.
You must first read the numbers of 10, 1 0,000 and1100 million, then10,000, and finally 100. (that is, reading from a high position) Numbers of 100 million or 10,000 levels are all read by individual levels, followed by 100 million or 10,000. The zero at the end of the stage is not read, and the zero in the middle of the stage must be read. No matter how many zeros there are in the middle, read only one zero.
2, the writing method within 100 million.
Write from the top in numerical order. If there is no one in the middle or at the end, write 0 on that one.
3. Method of comparing numbers.
Multi-digit comparison size, if the number of digits is different, then the number of digits is large and the number of digits is small. If the digits are the same, start with the first digit from the left, which number is larger and which number is larger. If the first digit from the left is the same, start to compare with the second digit … until the size comparison is finished.
Mathematics learning methods and skills
1, enrich the appearance through words and hands.
When I teach "square area", let students find the square around them first, then compare the areas, and then draw a square by themselves, thinking about why their areas are different and how to find the square area. After summing up the solution of square area, let the students compete to see who can calculate quickly. Finally, an example is given to illustrate how to calculate the area of a square object in daily life.
2. Arouse students' enthusiasm, express their opinions and pay attention to application.
In addition to cultivating students' thinking ability, mathematics discipline must not ignore students' oral expression ability. After learning mathematics, most students have various ideas about knowledge and application. We can't think that the training of oral expression ability is the patent of Chinese class. At this time, let students express their ideas and opinions more, which is helpful to improve students' interest in learning mathematics. At the same time, it also cultivates students' enthusiasm for pursuing true knowledge; It also eliminates students' learning tension and allows students to firmly master knowledge in a relaxed and happy environment.
3. Draw inferences from others and cultivate creativity.
Let students experience and participate directly, generate ideas in the activities, give students hands-on operation, and stimulate their interest in learning with the opportunity of thinking. In addition to stimulating students' thirst for knowledge in various ways, we should also pay attention to cultivating students' creative ability, that is, the ability to draw inferences from others, so as to expand students' thinking and increase their knowledge. For example, when teaching "parallelogram area", let students master the solution of parallelogram area by splicing two identical parallelograms into rectangles. At the same time, give students two identical trapezoids and remind them of similar methods to find the area, so that students can draw inferences and experience different graphics and the same method to find the area. At the same time, some performances can be designed appropriately, for example, let two students play with two trapeziums or parallelograms with the same shape, and try to form a rectangle after the performances meet. Small activities can stimulate students' creativity. During the whole performance, students' mood will be high and their enthusiasm for learning will be improved.
Related articles on the induction of mathematics knowledge points in the fourth grade of People's Education Press;
★ Knowledge points of the first volume of fourth-grade mathematics in People's Education Edition
★ Summarize the knowledge points of the first volume of mathematics in the fourth grade of primary school.
★ Knowledge points in the first volume of fourth grade mathematics
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★ Summarize and sort out the knowledge points of fourth grade mathematics.
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★ Summarize the knowledge points of the fourth grade mathematical triangle.
★ Knowledge points of the fourth grade math exam
★ The review materials of the second volume of mathematics published by PEP in the fourth grade of primary school are arranged.