Identify which condition is necessary for a number to be rational.

Question

A. It must not be an endless decimal
B. It must not be negative
C. It must be written as a fraction
D. It must be able to be expressed as an integer divided by a nonzero integer

Answer 1

The necessary condition for a number to be rational is:

D. It must be able to be expressed as an integer divided by a nonzero integer.

This definition captures the essence of rational numbers, which are defined as numbers that can be expressed in the form \( \frac{a}{b} \), where \( a \) is an integer and \( b \) is a nonzero integer.