Excerpted from a mother's blog: A few months ago, I was also a confused mother. How to teach my children math has become a headache for me. I always thought this was a teacher's business. Children can learn from teachers in kindergarten, but this is a child who is extremely sensitive to mathematics. It seems that she can't wait for the teacher to teach her. After four years old, she entered the world of addition and subtraction with ladder mathematics. First, she learned the basics of addition and subtraction. You must learn to count the reciprocal of 1- 100, 100- 1, and count things within at least 20 minutes. All these things were done when the child was four years old, especially the countdown, which surprised me because I never taught her. So I often say that this child is very sensitive to numbers. It is very difficult to add children under 10. However, children must see the real thing at the beginning of subtraction, especially things like 10-9. It seems easy for us, but the children find it difficult to calculate. When thinking about subtracting a large number from such a large number, children always make mistakes at first. I just ordered the children to say, "10-9=, how much is 10 more than 9?" In a word, children's subtraction within ten levels. How to teach children to learn addition and subtraction? -Basic addition and subtraction thinking This year's children will have a big class, and I think this is enough. I don't want to be surprised to find that the little guy can already carry it. Although I knew I had counted it in my mind, it still surprised me. So I began to look everywhere for ways to learn to carry. I found it in the mental arithmetic book that the child bought. The popular algorithm of 21st carry addition is the complement of ten. Then I asked the preschool class. It has also been confirmed. The so-called ten-point method, such as 8+7=, is 8+7 = 8+2+5 = 15, 16-9 = 16-3 = 7. This algorithm requires children to master internal addition and subtraction skillfully. I forgot a few times later. The fact is that when I did the problem later, the child clearly said the idea, only to find that the child still understood it. When adding any two digits to one digit, the children still use the method of ten, but depending on the type of questions, sometimes the front ones are put together, and sometimes the back ones are put together. I find it easy to make mistakes. Like this, 58+6=, and 23+9=. Fortunately, at this time, the little guy is very skilled in addition and subtraction within 20, so after thinking, I put forward such an algorithm: 58+6=50+(8+6)=50+ 14=64. Children accept it easily. Once again, I met the borrowing subtraction. I told my children the concept of borrowing for the first time, because it only involves two digits MINUS one digit, so it is not difficult to understand. It soon involves the addition and subtraction of two digits. It is easy to add and subtract integers, but neither number is an integer, and the child begins to make mistakes. I found that children actually have no concept of number, so we put them together to do the problem. Soon, the children understood the relationship between numbers, and I also found the benefits of verbal calculation. When you read 24, 2 means 20, and you will understand it immediately. This is much better than the vertical digital arrangement taught by preschool. Much easier to understand than this. Moreover, I have always disapproved of teaching children to count vertically. Children who understand are better. Children who don't understand just do mechanical addition and subtraction within 20. Even if they can do it, they don't understand the relationship between numbers and the concept of quantity. Moreover, learning oral arithmetic will only make it easier to learn vertical arithmetic, so I won't teach her vertical arithmetic for children. Let's leave it to the kindergarten teacher. How to teach children to learn addition and subtraction? -Addition of two digits and subtraction of abdication The most difficult thing is addition of two digits and subtraction of abdication. I've been thinking about how to tell my children that I've been following them since I started learning addition and subtraction. She will do as I teach, and I will take the initiative to think first in the last class, but when I want to understand how to teach, the little guy unconsciously runs to me. One day, I wrote 27+ 14= when I wanted to teach my child to do addition on a whim. The child immediately stopped me and said, "Mom, you don't have to teach me, I can do the math myself." The children thought for a while and blurted out, "4 1." I was surprised and asked, "How did you work it out?" Children's algorithm is 27+14 = 27+10+4 = 37+4 = 41,and the idea is correct, but my method is 27+14 = 20+/kloc-0+7+. The children still listened to my algorithm. Borrowing two places to do subtraction is the only time I teach it first, 54-28 =, and my idea is 54-28. First, 50-20 equals 30, and 4-8 is not enough for subtraction. Borrowing from 30 10, then 30 becomes 20, followed by 14-8 = 6. I know the children themselves are quietly digesting it. A few days later, when I asked again, the child had worked out the correct answer before I spoke. Children's addition and subtraction are all done in the state of oral calculation. Children are very interested in numbers and sensitive, so they have made rapid progress, which even surprised me. I think the most important thing in the whole process is to cultivate children's concept of number, which is very good in ladder mathematics and new thinking mathematics training. It saves me a lot of time. The arrangement of diced mushrooms makes the concept of numbers clearer and easier for children to understand. Because my teaching process is mostly after the children can do the problems themselves, and the time for the children to accept them is very short, I think it is also very important for the children to understand themselves. Even if she can work it out in the most stupid way, it shows that she knows the relationship between numbers. What we can do is to make it easier for children to understand and operate.