It really depends on the type of problem you are trying to solve. Did you have a specific problem in mind?
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Look for examples and context. For example, a recipe will always talk about fractions of cups, tablespoons, etc. If you're talking about the chance of rain, you would express that as a percentage.
No but percentages are ratios.
They are all different ways of representing the same thing: a relationship between two numbers.
a fraction is an amount of something and a ratio is how much of something there is.
Yes. In fact, fractions can be thought of as vertical ratios.