Education Elementary school society that makes sense

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Education : "What is the origin of the word to answer questions from elementary school society, such as" What is the origin of the word hard? ". You can understand the reasons for things, so you don't have to do unnecessary memorization anymore. A deeper understanding from the basics. An essential learning method that is also useful for junior high school entrance exams.