On the evening of April 7, 2022, friends from Guangdong Deng Yingyuan's famous teacher studio gathered in the clouds excitedly, because the studio welcomed the leader of primary school mathematics: the special-grade teacher, and the key lesson for in-depth study was Teacher Wu's The Meaning of Decimals.

The third group of outstanding student representatives deeply analyzed the lesson "The Meaning of Decimals" by Mr. Wu from the perspectives of teaching materials, disciplines, students, teaching and evaluation, and finally listened to Mr. Wu's lecture on the consistency between "number" and "operation".

Mr. Wu is a core member of the national compulsory education mathematics curriculum standard-setting group. According to Mr. Wu, the new curriculum standard of primary school mathematics will be introduced soon, the core of which is the consistency between "number" and "operation", and "the meaning of number" is the important basis of "operation of number". The operation of numbers is a reinterpretation of the meaning of numbers.

The understanding of logarithm and the calculation of logarithm are in the same strain. Through calculation, we can further understand the essence of "number" and understand the process of unit refinement.

For example: 0.36×2.5, they will only multiply by 36×5. Combined with Mr. Wu's lecture spirit, we can give the students the following explanations:

0.36× 2.5 = (36× 0.01)× (25× 0.1) = (36× 25 )× (0.01× 0/), and 0.36 contains 36 zeros. How to determine the position of the last decimal point, because the new decimal unit becomes the product of 0.01× 0.1= 0.001.36× 25? The decimal point 900 is shifted three places to the left, and the result is 0.9.

This well proves that teacher Wu said that making students feel the refinement of decimal units is an important basis for understanding the operation of numbers.