It doesn't equal anything.
Although it can be considered infinite.
The equation is undefined when the 0 is on the bottom of a fraction. This is because division by zero is not defined in mathematics and leads to undefined values. If the 0 is on the top of the fraction, the equation can still be evaluated and the value would be 0.
0/0
As long as the top number is equal to the bottom number, the fraction is equal to one.
This is the denominator, which is the bottom line of the fraction.
It is equal to 0.
Zero
It is a whole number which would equal 1 or more
0. Whatever the denominator - unless the denominator is also 0 in which case the fraction is undefined.
Multiply the numerator (top) and the denominator (bottom) of the fraction by any non-zero integer. You will have an equivalent fraction.
numerator
It is a rational number. The reason that it is rational is that you can represent it as a fraction, where the denominator (the number at the bottom of the fraction) is not equal to 0.So, for example, as we could write the number 15.125 as 15125/1000 then it is rational.
It is not equal to anything. Division by zero is not a valid operation.