A problem is usually posed in the form of a question.
I'm guessing you're working on the "edHelper" worksheet?
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When a problem comes up, it is usually easier to solve it yourself.
It is problematically.
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.
23.5 is a number. In itself, it is NOT a problem.
obelus (singular form) obili (plural form)