At my age, usually by remembering how I solved it last time.
If it's a new problem, and if I'm smart enough to recognize it as a significant problem, then the first step is to define just what the problem is.
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yes, you will find that there is always someone around on this site who can usually help answering your questions.
by experimenting..
Calculus was invented to solve physics problems, so the importance of studying calculus is to solve physics problems.
There is no single method to solve all types of fraction problems. Some problems and their solutions are relatively simple, others are extremely difficult.
Well, you can solve your problems easily by asking friends or family, or thinking through how you can. Maybe ask teachers or therapist.