How many positive rational numbers less than 1 are there such that the sum of the numerator and denominator does not exceed 10?

Write the following rational numbers in ascending order:

Write 5 rational number between and having the same denominators.

Suppose and are two positive rational numbers. Where does lie, with respect to and ?

How many rational numbers are there strictly between 0 to 1 such that the denominator of the rational number is 80?