Through the promotion of the story, the captain of multiplication in the buyer and seller countries let the children gradually realize the limitations of "number" and addition and feel the simplicity of multiplication.

In the story, after the appearance of the 99 multiplication table explored by the clever multiplication captain, the problems were solved for the buyers and sellers, thus making the children realize the application value of multiplication.

After the story, Mr. Liu asked the children to enter the history of mathematics, and asked the multiplication team leader to introduce the "origin of multiplication", thus leading the life world to the symbol world and letting the children feel the changeable charm of the mathematics kingdom.