Therefore, the similar value of quadrature is based on the similar value of a decimal, but it is novel to take the similar value in combination with reality without principle, so that students can find out the detailed discussion of mathematics knowledge and life reality, and also explain the specific topics of students.
The order of multiplication, multiplication, addition, multiplication and division of decimals is the same as that of integers, and the operation law of integer multiplication is also applicable, which shows that the operation law of multiplication has a wider significance. It should be a good habit for students to carefully examine the questions and establish a sense of "lightness" and "agility" in solving problems.
Advocate teaching methods
The significance, calculation rules, operation sequence and application of arithmetic rules of decimal multiplication are closely related to integer multiplication. In teaching, discussing the related knowledge of integers and finding similarities and differences through comparison will not only help students to find the internal discussion of mathematical knowledge, but also help them to build a comprehensive knowledge system and greatly reduce the difficulty of teaching. For example, when teaching the calculation essentials of decimal multiplication, let the students complete integer multiplication first, then add decimal points to the factors on this basis, and then let the students discuss the completion of the experiment and talk about the credentials. Then compare the similarities and differences between integer multiplication and decimal multiplication in calculation, and the same is true when learning to apply the law of multiplication to simple calculation. Review the simple calculation of integers first, and then change them into decimals. It is decided that analogy transfer can make students really understand the broad significance of the laws of multiplication, exchange, unity and distribution, and achieve the effect of reviewing the old and learning new things.
When teaching decimal multiplication calculation and simple calculation, students' proficiency in calculation should be submitted in detail. Because it is the direct basis of the four miscellaneous operations of integer and decimal in Unit 2, it can improve students' proficiency on the basis of ensuring accuracy, and can accept various internship situations such as choosing accurate results, being firm in right and wrong, competition, and managing practical problems in life. To prevaricate the simple calculation in decimal multiplication, we should cherish the guidance of students' problem-solving ideas and differences, combine it with oral calculation, and let students take the lead. For example, 2.5× 1.2 can be simplified by multiplication unit 1 law (2.5×0.4×3) or by multiplication distribution law (10.2) = 2.5×12.5× 0.2, which can be integrated like some simple problems. In daily oral arithmetic practice, clever specific strength questions can help students distinguish different algorithms and find the best one among them.
The similar value of quadrature is based on the similarity of decimal places, and there is no more new knowledge. Therefore, it is necessary to discuss in detail the actual life of students, so that students can use the knowledge of this department to manage the practical problems in life, such as calculating the total price when shopping, calculating the monthly electricity bill at home, learning to read invoices, audit accounts, measure, and calculate the length, width, area and desktop area of the blackboard. Carrying out colorful exploration and practice activities can not only improve students' ability to manage practical problems, but also cultivate students' interest in learning. In addition, add some relevant extracurricular knowledge appropriately. As common as finding similar numbers? Quot "round" method, but also occasionally accept "into a law", "to a law", "four houses and six laws". In this way, we can broaden students' horizons.
I hope to adopt my answer! ! !