Theorems, formulas and concepts in primary and junior high schools are really not difficult. As long as you are willing to use snacks in your study, there is nothing you can't remember, but high school mathematics is more difficult than primary school and junior high school. Some advice for your children:
First, the foundation is weak, so make up the old scores first, make up the lessons that were missing before, and take out the previous math textbooks, exercise books, test papers and wrong questions to make up. At the very least, you should remember all the knowledge you have learned before and use it to lay a good foundation. A weak foundation is like being a geometry, but you can't even add, subtract, multiply and divide. How to learn?
Second, if you can't remember the concept of the formula, just bury your head in it. Anyway, these must be remembered. You must remember that if you can't remember the most basic formula theorem, mathematics is out of the question. This is the most basic requirement for learning mathematics.
Third, remember that the concept of formula is not everything, and it is more important to learn to use it. Math was not good before the third grade, and even failed in the math exam. I remember all the formulas and theorems taught by the teacher, but I can't use them. When I get problems, I don't know how to use them to solve them. Formulas and theorems only stay in the words of formulas and theorems, and I have never learned to use them at all.
I spent half a semester studying mathematics, hovering from the past 60 points to 90 points. The way is to do more problems, and I will be familiar with the application of formula theorem. Practice makes perfect. I'm sensitive to math. I didn't know how to write a question before, but when I saw a question, all kinds of theorems and formulas came out unconsciously. At a glance, I felt which formula had more theorems.
Therefore, even if you remember formulas, concepts and theorems, you should do more questions. You will definitely find it difficult at first, but don't give up. You can do it yourself and just refer to the answer. By doing a lot of questions: First, you can see all kinds of questions, classify and summarize them when you do them, and list the conditional questions when you look at them, so it is easy to find available formulas, do more questions, and remember formula theorems more easily. Then he wants to remember them. The second is to improve the sensitivity to mathematical problems, so that when you look at a problem at the beginning, your mind will be filled with corresponding formulas, theorems and problem-solving methods, and you will have a preliminary problem-solving idea, which is the minimum requirement for learning mathematics well.
Fourth, you cut off the formula of attending class and reciting. If you can't remember the formula, the effect of the class will be discounted. Don't do it separately, do it at the same time. Not only have to take classes, recite formulas, but also do more problems. Remembering formulas is the foundation, doing problems to improve the sensitivity of mathematics, and listening to classes to broaden our thinking. Personally, I think the most important thing is to do more questions. The application of formula theorem will still be immature if you attend more lectures and do fewer problems. After listening to the class, you should summarize it yourself. As long as children are willing to study hard, mathematics will not be bad.
Finally, it is unpleasant to say that your child can't even remember the concept of formula. Is it because his learning attitude is not correct enough or he is afraid of mathematics? I suggest you communicate with your child to understand his crux and help him solve his difficulties.