In the IB calculators prove not only essential for many questions but also a great way to save time over written methods. In the pdf below you can find flashcards for 16 of the most useful uses of the GDC, with example questions and answers illustrated for Texas calculators.
All the methods above can also be done using Casio calculators, however as I don’t own one I’m probably not the best to give advice on the matter. If anyone else does want to make a guide for Casio calculators that would be amazing!