Final answer:
To multiply mixed numbers, convert them to improper fractions, then multiply the numerators and denominators separately. Finally, simplify the resulting fraction.
Step-by-step explanation:
To multiply mixed numbers, we need to first convert them into improper fractions. Let's convert 2 1/3 to an improper fraction:
2 1/3 = (2 * 3 + 1) / 3 = 7/3
Now, let's multiply 21 * 7/3:
21 * 7/3 = (21 * 7) / (1 * 3) = 147 / 3
Finally, simplify the fraction:
147 / 3 = 49