A textbook for learning the basics of ICT. - Title: Information Basics: Learning the World of ICT for the First Time - Author: Yoshifumi Ueno - ISBN: 978-4-86317-068-1 - Contents: Explains basic knowledge such as the correspondence table of decimal, binary, and hexadecimal numbers. Thank you for viewing. Please note that there are some marks and writings, as seen in the third image.