What are the two interchangeable terms for fractions like 2/3 and 3/4, which describe a relationship between the two numbers?
The top number is the NUMERATOR
the bottom number is the DENOMINATOR
I don't know two interchangeable terms, but these are examples of "proper fractions" where the numerator [ top number] is less than the denominator [ bottom number ]
+1438 
+36915 
