Elementary School Mathematics Teaching Materials "Teaching the Concept of Functions" Published by the Ministry of Education in 1973 (Showa 48) This material is an extremely valuable teaching resource that examines and organizes how to systematically cultivate **"functional perspectives and ways of thinking"** in mathematics education based on the 1968 (Showa 43) Course of Study. It serves as an important primary source for understanding how the concept of functions was positioned in elementary school mathematics and what kind of developmental teaching plans were envisioned at the time. It is highly valuable from the perspectives of educational history, mathematics education history, and curriculum research, and is a difficult-to-obtain resource even for researchers and university libraries. ◎ Condition: There is some yellowing and wear due to age, but the preservation condition is good. ◎ This material is currently difficult to access even at public institutions, and is recommended as a valuable primary source for those researching the changes in educational history and mathematics education.