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Those are commonly used for working with fractions. You need the least common multiple to find a common denominator, for adding or subtracting fractions. And after doing some manipulations with fractions, you need the greatest common factor to simplify the fractions.Now, whether this is sufficiently "real-life" for you, is another issue. Depending on the career you choose, you many need to work with fractions on a daily basis, or you may hardly ever need them.
You use fractions for LOTS of things in the real world like money, gambling, shopping, clothing, etc.
in cookbooks and recipes
there are None!
they aren't used in real life, not unless you need them in a situation were you would need to use them.