## Key Concepts

**Multiply or divide mixed numbers.**- Convert the mixed numbers to improper fractions.
- Follow the rules for fraction multiplication or division.
- Simplify if possible.

**Simplify a complex fraction.**- Rewrite the complex fraction as a division problem.
- Follow the rules for dividing fractions.
- Simplify if possible.

**Placement of negative sign in a fraction.**- For any positive numbers \(a\) and \(b\), \(\frac{-a}{b}=\frac{a}{-b}=-\frac{a}{b}\).

**Simplify an expression with a fraction bar.**- Simplify the numerator.
- Simplify the denominator.
- Simplify the fraction.

## Glossary

### complex fraction

A complex fraction is a fraction in which the numerator or the denominator contains a fraction.