What is the fraction between #1/3 and 1/5#?
The fraction exactly between them is
There are many, many fractions between
Using a larger number as the denominator allows you to find some.
'The' fraction implies the fraction exactly halfway between them.
The obvious answer would seem to be
Find equivalent fractions for
However, if you choose a larger denominator you will easily see how many other fractions there are.
are all between