Write \( \frac{21}{4} \) as a mixed number.

To convert \( \frac{21}{4} \) into a mixed number, divide 21 by 4. The result is 5 with a remainder of 1, which means you have 5 whole parts and \( \frac{1}{4} \) left over. So, \( \frac{21}{4} \) can be expressed as the mixed number \( 5 \frac{1}{4} \). Next time you need to convert an improper fraction to a mixed number, remember to focus on dividing the numerator by the denominator, as it not only simplifies the problem but also opens the door to understanding fractions and real-life applications much better, such as sharing pizza slices! Keep practicing, and you'll be a mixed number master in no time!