You use fractions (or some variation, such as decimals) in any situation where whole numbers are not sufficient. For example, when you want to measure the object of a length in meters, and a whole number of meters is not precise enough.
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You use fractions when picking shoe sizes and when cooking for measuring plus more.
You use fractions for LOTS of things in the real world like money, gambling, shopping, clothing, etc.
in cookbooks and recipes
there are None!
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.
Umm you divide...