The teaching content of "Biduo" is to let students learn to describe the size relationship between two numbers with words such as "much more", "much more", "much less" and "little less" while passing the rich numbers within context awareness 100, and initially learn to experience the ratio with estimation methods. With the participation of students, I realized that life is full of mathematics and colorful life. The words "more", "less", "more" and "less" are often used in students' daily life and have a certain knowledge base. I think what we need to do is to give students a chance to speak their own language.