Tip: there is an ever faster way to use secondary functions, which will become with time your preferred way because of its immediacy.
You just need to touch the button under the secondary function you want to use, and start moving your finger upward as if the orange menu was already there.
As easy as a swipe
Tap on any formula to instantly import it into your calculation.
You can keep a list of your college exams and have it show you their average score, or keep track of your monthly expenses and have their sum always at hand.
The possibilities are countless!