Question

Why is 5.1 a rational number

Answer 1

5.1 can be written as 51/10 (the quotient of the integers 51 and 10. So it is a rational number

Explanation:

Recall that a rational number is a number that can be written as the quotient of two integer numbers.

In particular the number 5.1 can be written as 51/10 (the quotient of the integers 51 and 10. So it is a rational number.