Ontario Mathematics Proficiency Practice Test

A rational number is defined as any number that can be expressed as a fraction where both the numerator and denominator are integers, and the denominator is not zero. This definition encompasses various types of numbers, including whole numbers (which can be represented as fractions with a denominator of one), proper and improper fractions, and terminating or repeating decimals, which can all fit the criteria of being expressed as a fraction of two integers.

The other choices do not align with the definition of rational numbers. Whole numbers are a specific subset of rational numbers, but they do not encompass all rational numbers. Likewise, having a decimal point does not automatically qualify a number as rational since some decimal numbers can be non-terminating and non-repeating, which are classified as irrational numbers. Lastly, a number that cannot be expressed as a fraction directly contradicts the definition of rational numbers since rational numbers are intrinsically defined by their ability to be represented in fraction form.