This is computing power. As far as mathematics is concerned, Sudoku tends to be logical, while addition and subtraction are arithmetic. As far as comprehensive ability is concerned. I think it is accumulated over time, and the companionship and patience of parents are more important than the methods of this period. For example, calculation should be materialized from a small place. Like apples? A banana, so how much fruit is there? This makes things harder every day. In addition, there is another aspect of children's ability to answer questions: comprehension. For example, he knows that apples and bananas belong to fruits. This ability exists not only in life, but also in many books to be read. Logical ability is based on the above. Without the concept of number and common sense, logic is easily confused.