To multiply fractions, multiply their numerators together and multiply their denominators together.
\[ \frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d} \]
To divide fractions, turn the second fraction upside down and then multiply the fractions instead.
\[ \frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c} = \frac{a \times d}{b \times c} \]
Change all mixed numbers into improper fractions before multiplying or dividing.
To find a fraction of a quantity, multiply that fraction by the quantity.