1. Preparation tools and materials: a computer, a USB flash drive, and the electronic version of the second volume of the third grade mathematics textbook (PDF format).
2. Open the PDF document on the computer and check whether the document is complete and correct.
3. Insert the USB flash drive and wait for the computer to detect the USB flash drive and open the USB flash drive window.
4. Copy the PDF document of the second volume of the third grade mathematics textbook to the USB flash drive to ensure the correct copying process.
5. Pull the USB flash drive out of the computer and insert it into the computer that needs to read math books.
6. Open the PDF document in the USB flash drive and use the PDF reader to view the contents of the math book.
7. If you need to check the contents of the math book conveniently, you can copy the PDF document to the computer hard disk, install a PDF reader on the computer, and check it at any time.