These lessons, with videos, examples and step-by-step solutions help Algebra students learn how to add rational expressions.

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**What are Rational Expressions?**

A rational expression is a fraction in which the numerator and/or the denominator are variable expressions.

**How to add or subtract rational expressions with unlike denominators?**

- Factor all of the denominators.
- Determine the least common denominator (LCD) from the factors.
- Multiply the numerator and denominator of each fraction by any missing factors to form the LCD.
- Add the fractions.
- Simplify if possible.

**How to add and subtract rational expression with and without like denominators?**

**How to add and subtraction rational expressions when the denominators are different?**

**Rational Expressions - Adding with Common Denominator**

How to add rational expressions that already have a common denominator, and how to simplify if it is possible to cancel?

**Adding or subtracting rational expressions with same denominators**

**Finding the LCD for rational expressions**

**Adding rational expressions, different monomial denominator**

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