Did you teach him to count, or did you just count orally? If you have a good memory, you can count to 100 orally (but this is just "memorizing numbers", not really understanding the concept of numbers, but it is also a necessary basis for learning mathematics).

Do you teach your child to recognize only numbers, or do you ask him to associate numbers with physical numbers? In the early stage of the development of the concept of number, number and matter were separated, that is to say, he could not understand the abstract concept of number, and he had to summarize the relationship between matter and number through repetition.

My recommendation method: Count everything you can, for example, when you go down the stairs, for example, when you come back from buying apples, but not all the time, but in random situations, because you can see concrete images, with sounds and activities, so that you will be more impressed, random and flexible, and not so boring.

The development of children's counting ability: oral singing-counting by things-telling the total number-counting from any point in the sequence-taking things by numbers-counting by groups. Such a process. In this process, step by step slowly, and each step gives enough time to be flexible.

Now my child is three and a half years old, and he can count to one hundred orally (he can recite it by himself). Except for the group calculation, the rest are basically no problem. Two days ago, on a whim, he counted the electronic keys himself, 32, and none of them were wrong. However, in the end, it is the most primitive stupid method-counting all countable numbers in a random environment. In the process of counting, children will naturally realize the above sequential process. Nothing else, that's all.