If you carefully read the end of chapters, you may find some parts which just aim to teach children learning how to learn and value mathematics. For example, in third grade, (p. 31), there are explanations of how to use the notebook with the questions such as “What do you want to do next?” . It means that this textbook attempts to develop children's desire to learn by themselves. On the format of the notebook, which is explained in the textbook, children can learn how to write the explanation with various representations and how to evaluate other children's ideas.