A math teacher is presenting a lesson on fractions. Which of the following would be an appropriate example of a mixed number?

A mixed number is defined as a whole number combined with a proper fraction. The example given, 2 3/8, fits this definition perfectly as it consists of the whole number 2 and the fraction 3/8.

In contrast, the other options do not represent mixed numbers:

• The first option, 1/4, is simply a proper fraction with no whole number component.

• The third option, 0.25, is a decimal representation of a fraction and does not include any whole number.

• The final option, 14/3, is an improper fraction, where the numerator is greater than the denominator, but it does not include a whole number separate from the fraction.

Therefore, the choice of 2 3/8 distinctly illustrates a mixed number, combining both a whole number and a fraction into a single expression.