In your calculator:
From air (n = 1) to crown glass (n = 1.523):
This way should work on both types of calculators – when you do this your calculator should end out showing 0.04296…….
If it does not then you may have to play with the order of ( ) keys or where you press the = key. The first time, make sure that you do not press the = key until you have gone through the whole calculation.