What is a scientific calculator? What is a programmable calculator? What is a graphing calculator? What is an OHP calculator? What is the D.A.L. system? How is the D.A.L. system different from V.P.A.M.? What should I pay attention to when buying a new scientific calculator? Are the functions and operating methods different between educational and general scientific calculators? Why are scientific calculators used in education? Tell me about cheating prevention and the model certification system.

Why does the display automatically turn off? Should I be concerned about the operating time of the EL-531VH, since it is only powered by batteries? What does Twin Power mean? The graph display is hard to see. How can I turn the power off? What does 2ndF mean? No keys react. How can I clear the display, and start over? (EL-9900, EL-9650, EL-531VH etc.) How can I move the decimal point? (EL-531VH) When I calculate , I can't get the answer 3. Why does this happen? How can I get the right answer? I can't get 0.5 from sin30. Why does this happen? How many steps can I go back to when using the Multi-Line Playback function? (EL-531VH etc.) How can I get further information on this model? How can I use the unique functions of this model? (EL-9650, EL-531VH, etc.) I'm using an EL-9400; can I transfer my programmes to an EL-9450? I'm using an EL-9650 (EL-9600c); can I transfer my programmes to an EL-9900? Can I enlarge the memory capacity of the graphing calculator? Can I keep the content of the memory when changing the batteries of the graphing calculator? Can I print the display and data of the graphing calculator? Can I e-mail data and displays made on the graphing calculator? How can I get a touch pen, hard case, etc?