Any one - it will depend on the situation.
If you are talking about the fraction bar in mathematics, the "fraction bar" is the real name. It is sometimes called a vinculum (although this is a misuse of the word). The fraction bar in amateur radio, also known as the forward slash is officially known as the "fraction bar."
Unless you are an electrical engineer or a math teacher, every number you will ever use in a real world situation will be a real number.
because then there would be too much water use.
Well, since there is no such thing as a sphare in the real world, it is a bit hard to tell what it can or cannot use.
use a absolute value to represent a negative number in the real world
the fraction 22/7 is a close approximation to 3.14159265
Yes
use a absolute value to represent a negative number in the real world
you wouldn't
To add fractions.
Jeopardy.