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You need to learn fractions because they show up in every day life. You can for example say that someone can half of your lunch.
It depends on what you want to convert to proper fractions. Not all things can be converted to proper fractions.
if fraction didn't exist we will never know it or learn it and never understood it :)
Math is related to fractions. if you look in a math book or just online then one of the math topics is fractions. You learn how to divide, multiply, add and subtract, simplify and more about fractions and what to do with them.
Arithmetic.