A teacher writes the 12, 1/3, 6/8, 54/34, 98, 23, 5/8, 34/98, 1, and 60 numbers on the blackboard and asks their students to find out the rational numbers. Ravi, one of his students answers 1/3, 6/8, 54/34, 5/8, and 34/98 as the correct answer. Ravi's response is based on ________.