## Thinking Mathematically (6th Edition)

$\frac{2}{3}$ is a rational number that is not a whole number.
WHole numbers start at zero and continue to infinity in whole number increments, for example: 0, 1, 2, 3, 4, 5, ... There are not fractions in the set of whole numbers. The number $\frac{2}{3}$ is not a whole number.