No because one half is equivalent to ten twentieths!
There is no such thing because half that fraction will be smaller still.
1/2 of 10/20 = 1/2 of 1/2 = 1/4
That can't be quantified.
The equivalent fraction for five tenths is one half.
There is no limit to how small it can be. Given any fraction, half of it is smaller still.
Equivalent to what? No fraction is "equivalent" by itself; you can say that two or more fractions are equivalent, if they represent the same number.
equivalent fraction of 11/2 = 22/4 half of 11 = 11/2 equivalent fraction of 11/2 = 22/4
It is equivalent to some fractions, not to others!