1, the concept of separation: first of all, we must understand what separation is. Division is to divide a number into several numbers, and combination is to combine several arrays into a number. For example, dividing 5 into 1 and 4 means dividing 5 into two numbers, and merging 1 and 4 into 5 means merging two numbers into one number.
2. Symbol of separation and combination: We can use "+"and "-"to express separation and combination. For example, dividing 5 into 1 and 4 can be expressed as 5= 1+4, and combining 1 and 4 into 5 can be expressed as 1+4=5.
3. Order of on-off and on-off: Pay special attention to the order when explaining on-off and on-off. For example, if you divide 5 into 1 and 4, you should say 5 into 1 and 4 first, and then calculate the result, instead of calculating the result first and then dividing it.
4. On-off practice: To make students practice on-off, you can help students understand through objects or pictures. For example, use small sticks to demonstrate division and combination. Divide the five sticks into 1 and four sticks, and then combine them. Let the students practice again and again to deepen their understanding.
5. Application of division and combination: In mathematics learning, division and combination are widely used. For example, in addition and subtraction, division and combination can help students understand the concept of addition and subtraction; In multiplication, division and combination can help students understand the concept of multiple.
The importance of primary schools
Primary education is the foundation of national education, the basic project for the formation of population quality, the most basic school education that a person must first accept for his life development and daily survival, and the cornerstone of education in other stages. Personally, a good primary education lays a foundation for their healthy physical and mental development and provides conditions for them to receive secondary education.
Primary school is not a simple compulsory period, nor a narrow growth station, but an irreplaceable starting point of life and an insurmountable stage. Therefore, when we understand the important position of primary education, we should deeply understand the initial value of primary education, grasp this special educational opportunity, and give full play to the functional role of primary education.