Teaching in kind: You can use balls, building blocks and other objects with quantitative characteristics, so that children can gradually understand numbers such as 20, 30 and 40. For example, 10 building blocks form a ten-digit number, and then 1~9 digits are added to the ten-digit number, gradually expanding to numbers such as 20 and 30.

Teaching with digital images: add relevant images to the numbers to help children better understand the meaning of the numbers. For example, 20 balls or 20 sweets can be drawn on the number 20.

Teaching by using mathematical games: Use interesting teaching AIDS such as digital games and mathematical puzzles to help children feel the relationship between numbers through games, so as to gradually know more numbers.

Creating life situations for teaching: Use daily life situations, such as shopping and ordering food, to let children feel the application of numbers personally, so as to deepen their cognition of numbers.

It should be noted that children's interests and needs should be respected in the teaching process, so that children can learn numbers in a relaxed and pleasant atmosphere and gradually improve their digital cognitive ability. At the same time, it also needs patience and continuous teaching. Don't force children to master all the graphics at once.

I hope to adopt.