1. The content of the fourth grade mathematics handwritten newspaper
1. Names of numbers in the multiplication formula: "×" is the multiplication sign, numbers before and after the multiplication sign are called factors, "=" is the equal sign, and numbers after the equal sign are called products. 10 (factor) × (symbol) 200 (factor) = (symbol) 2000 (product)
2. Parallelism: When there is no common point between two straight lines on a plane, two planes in space or a straight line in space and a plane, they are said to be parallel. As shown in the figure, the straight line AB is parallel to the straight line CD and marked as AB∑CD. Parallel lines will never intersect.
3. Verticality: two straight lines, two planes intersect, or a straight line intersects a plane. If the intersecting angles are right angles, they are called perpendicular to each other.
4. Parallelogram: Two groups of parallelograms with opposite sides on the same plane are called parallelograms.
2. The fourth grade mathematics handwritten newspaper content
Static definition of 1. angle (1)
A figure composed of two non-coincident rays with a common endpoint is called an angle. This common endpoint is called the vertex of the angle, and these two rays are called the two sides of the angle.
(2) Dynamic definition of angle
The figure formed by the rotation of light from one position to another around its endpoint is called an angle. The endpoint of the rotated ray is called the vertex of the angle, the ray at the starting position is called the starting edge of the angle, and the ray at the ending position is called the ending edge of the angle.
2. Angle symbol: Angle symbol:
3. Type of angle: the size of the angle has nothing to do with the length of the side; The size of an angle depends on the degree to which both sides of the angle are open. The bigger the opening, the bigger the angle. Conversely, the smaller the opening, the smaller the angle. In dynamic definition, it depends on the direction and angle of rotation. Angles can be divided into acute angle, right angle, obtuse angle, right angle, rounded corner, negative angle, positive angle, upper angle, lower angle and 0 angle, which are 10 respectively. An angle measuring system in degrees, minutes and seconds is called an angle system. In addition, there are secret system, arc system and so on.
(1) acute angle: an angle greater than 0 and less than 90 is called an acute angle.
(2) Right angle: An angle equal to 90 is called a right angle.
(3) Oblique angle: An angle greater than 90 and less than180 is called obtuse angle.
3. The fourth grade mathematics handwritten newspaper content
1. straight line: a straight line is the trajectory of a point moving in the same or opposite direction in space. 2. Line segment: A line segment is represented by letters or lowercase letters representing its two endpoints. Sometimes these letters also represent the length of a line segment, which is recorded as line segment AB or line segment BA and line segment A .. where AB represents any two points on a straight line.
3. Line segment characteristics
(1) finite length, which can be measured.
(2) Two endpoints
4. Line segment properties:
(1) The line segment between two points is the shortest.
(2) The length of the line segment connecting two points is called the distance between these two points.
(3) Two points on a straight line and the part between them are called line segments, and these two points are called the endpoints of the line segments.
There is no distance in a straight line. Ray has no distance. Because a straight line has no end point, and a ray has only one end point, it can extend indefinitely.
4. The fourth grade mathematics handwritten newspaper content
1. Generation of Numbers: Origin of Arabic numerals: After the ancient Indians created Arabic numerals, they spread to the Arab region around the 7th century. By the 3rd century A.D./KLOC-0, the Italian mathematician Fibonacci wrote Abacus, in which he introduced Arabic numerals in detail. Later, these figures spread from the Arab region to Europe. Europeans only know that these numbers are imported from the Arab region, so they are called Arabic numbers. Later, these figures spread from Europe to all countries in the world. Arabic numerals were introduced into China around 13 ~ 14 century. Because there was a number called "chip" in ancient China, which was easy to write, Arabic numerals were not popularized and used in China at that time. At the beginning of this century, with the absorption and introduction of foreign mathematical achievements by China, Arabic numerals began to be used slowly in China, and only now have they been popularized and used in China for more than 100 years. Arabic numerals have now become the most commonly used numbers in people's study, life and communication.
2. Natural number: a number used to measure the number of things or to indicate the order of things. That is, the numbers represented by the numbers 0, 1, 2, 3, 4, and ... the numbers representing the number of objects are called natural numbers, and they form an infinite group one by one from 0 (inclusive).
3. Computing tools: abacus, calculator and computer.
4. Light characteristics
(1) ray has only one endpoint, and it extends from one endpoint to the other indefinitely.
5. The fourth grade mathematics handwritten newspaper content
1. Understanding of large numbers: understanding of numbers within (1) billion;
One hundred thousand:100000;
One million:100000;
Ten million:100000;
1 100 million:1010 million;
2. Numeralization: Numeralization is a way for people to remember Arabic numerals. On the basis of numerical system (numerical order), numbers are read and written according to the principle of three-digit or four-digit grading. Usually, in the writing of Arabic numerals, decimal points or spaces are used as the marks of each number level, and the numbers are separated from right to left.
3. Several levels of classification
(1) four-digit classification method
That is, a four-digit grading method. The habit of reading in our country is like this. Such as: ten thousand (four zeros after counting), one hundred million (eight zeros after counting), and one trillion (12 zeros after counting, which is a normal number). These levels are called Level 1, Level 10,000 and Level 100 million respectively. ...
(2) Three-digit classification
That is, the three-digit grading method. This western classification, this classification is also an internationally accepted classification. For example, thousands, followed by three zeros and millions, followed by six zeros and billions, followed by nine zeros. ...
4. Numbers: Numbers refer to writing numbers in a row side by side, and each number occupies a position. These positions are called numbers. Starting from the right end, the first place is the unit, the second place is the tenth place, the third place is the hundred places, the fourth place is the thousand places, and the fifth place is the ten thousand places, and so on. This shows that the concept of counting unit and number is different.