The point card you said should be called "Dumanka". It was introduced from America, also known as Duman teaching method. It includes two kinds of cards: point cards and word cards.

Point card: a square white card. It's quite big, with a red dot on one side and numbers behind it, with symbols for addition, subtraction, multiplication and division inside. The number is 1- 100.

Word cards: There are many kinds, such as titles, furniture, fruits, animals and so on.

This theory about Du Man has been controversial since it entered the China market.

One school thinks that this card is mainly based on the baby's instant memory method, and it is used to let the baby learn with flash.

Another school believes that although parents have been told in the market that they need to develop their children's whole brain and improve their memory, the human brain is not a computer. No matter how powerful the brain is, it can't store a data cloud. Now many companies have their own clouds. How many brains do you have to remember these data? In the Internet age, the speed of information iteration is so fast that the half-life of knowledge is getting shorter and shorter. How do the memories of the past face the problems of tomorrow? What people need is creation, not storage.