First, study notes
Today is Monday, and we have an interesting math class. The teacher explained the multiplication and division of rational numbers. I listened carefully and wrote down the key contents. The multiplication rule of rational numbers is: the same sign is positive, the different sign is negative, and the absolute value is multiplied. The law of division is: the same sign is positive, the different sign is negative, and the absolute value is divided.
Through these rules, we can easily calculate the multiplication and division of rational numbers. This lesson gives me a deeper understanding of multiplication and division of rational numbers. I must practice more and master these operation skills skillfully.
Second, the process of solving problems.
Today, when I was doing my math homework, I met a difficult problem. The topic is: Given the circumference of a square is 20 cm, find its area. Let me first set the side length of a square as a, and then according to the perimeter formula, there is 4a=20 and the solution is a=5. Next, according to the square area formula, the area S=a? Substitute a=5 to get S=25.
So, the area of this square is 25 square centimeters. Through this question, I reviewed the formula of the perimeter and area of a square and improved my problem-solving ability.
Third, questions and confusion.
In today's math class, the teacher explained the knowledge about angles. In class, I didn't understand the concept of "filling the corner" that the teacher said. Complementary angle means that the degrees of two angles add up to 180, so these two angles are complementary angles.
I think this concept is a bit abstract. After class, I decided to look up the information myself and understand the concept of complementary angle through more examples. I believe that as long as I think hard, I will be able to master this knowledge point.
Fourth, thinking and feeling.
Today, while studying mathematics, I suddenly realized that mathematics is closely related to life. In daily life, we often encounter all kinds of mathematical problems, such as calculating the price when shopping, family expenditure budget and so on. Mathematics is not only a subject, but also a tool, which can help us better understand the world and solve practical problems.
Five, interesting problems in mathematics
Today, I saw an interesting question in an interesting math book: a farmer raised a cow. He wants to use Niu Gengdi, but this cow is always running around, which is difficult to control. The farmer thought of a way. He tied the cow's tail to the stump so that the cow could only turn around. What is the radius of this circle? The answer is: the length of the cow rope.