"Which number" is the teaching content of the first volume of primary school mathematics published by People's Education Press. Video can be downloaded and searched on software, and video can be downloaded in the mobile phone application market. It is recommended to search (coach: Ji Dongxia) about 44 minutes of video, interesting animation and clear thinking, which can make children more willing to learn.

The teaching of "which number" is mainly to teach children how to identify and use numbers in their lives. As an ancient country with a culture of 5,000 years, China's figures can be said to be the crystallization of the continuation of our wisdom, and they play an important role in our social life all the time. I hope my answer is helpful to you.