Let students experience the process of abstracting the remainder phenomenon after average score into division with remainder. Understand the meaning, calculation method and practical significance of division with remainder, and know that the remainder is less than the divisor, so that students can accumulate observation, discussion and communication in the process of acquiring knowledge, solve some simple practical problems by using division with remainder, and cultivate students' attitude and habit of actively participating in study and life.
Specific analysis:
Understand the unit of counting "hundred" further, understand the unit of counting "thousand" initially, and tell the digit order of unit, ten, hundred and thousand. Through practical activities, we can understand the number within 1000, compare the sizes within 1000, calculate the addition and subtraction of the whole hundred, the whole hundred plus the whole ten and the corresponding subtraction, so as to cultivate students to look at things around them from a mathematical perspective.
Students know decimeter and millimeter in practice, establish the relationship between decimeter and millimeter, understand the progress rate between length units, make simple conversion and improve the estimation ability.
The process of letting students operate the calculation method of three digits plus two or three digits. Can write and add three digits within 1000, can use vertical calculation to calculate simple continuous addition problems, learn the checking method of addition and subtraction, and initially develop the habit of checking and calculating. Let students realize the importance of estimation in life and cultivate the habit of independent thinking.
Make students know the southeast, northeast and northwest, and identify the other seven directions according to the given direction. Make students feel the close connection between mathematics and daily life in the process of observing and solving practical problems. Let students go through the process of three-digit subtraction calculation method, learn the calculation method of subtraction, develop good calculation habits, and let students estimate according to specific conditions, understand the estimation process and formulate estimation strategies.
From the perspective of knowledge, primary school is a set of methods, and junior high school pays more attention to understanding problems from the essence of concepts, so it is necessary to establish a system. The knowledge of primary school is bit by bit, and the relationship between them is not very big. It focuses more on skills and problems. Primary school textbooks only talk about basic methods, but the difficulty is not up, and the essential things are not learned. The knowledge of junior high school emphasizes the sense of system, and the knowledge is more difficult.