Draw two trees and three flowers. According to the topic, since multiplication should be calculated by flowering trees, it must be flowers on the trees, so you only need to draw two trees and three flowers, and use multiplication to calculate several flowers in the book. Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and x is the multiplication sign. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integer, rational number and real number is a systematic summary of this basic definition.