Question

What is a rational number between 1/8 and 1/4

Answer 1

Any number that can be written as a fraction is rational! Since both 1/8 and 1/4 have the same numerator it is easy to compare them and see that:
1/5, 1/6, and 1/7 are all examples or rational numbers in between them.

You could also add both 1/8 and 1/4 and divide by 2 to get 3/16, which is also a rational number in between them.

Of course, these are examples of methods you could use over and over again, but there are also infinite more possible answers to your question.

Answer 2

1/6 is a rational number between 1/8 and 1/4