# Addition and Subtraction of Rational Expressions

1.   Adding and Subtracting rational expressions with like denominators (3:45)  This video contains one example of adding and one of subtracting rational expressions, namely:

[Example 1]

[Example 2]

2.   Practice: Adding and subtracting rational expressions with like denominators. Problems similar to:  . (4 problems)

4. Practice: Adding rational expressions with unlike denominators. Problems similar to . (4 problems)

5. Adding rational expressions: unlike denominators (5:11)  Problems such as .

6. Subtracting rational expressions: unlike denominators (4:47)  Solving .

7. Practice: Adding rational expressions with unlike denominators. Problems such as . (4 problems)

[Example 1] Find the of 36 and 12.

[Example 2] Find the of 12 and 18 (uses the prime factorization method).

9.   Finding the least common multiple with repeating factors (2:34)  Find the .

10. Practice: Find the least common multiple of two integers.   Find the . (4 problems)

11. Finding the least common multiple of polynomials (6:51)
Finds the least common multiple of and .

12. Subtracting rational expressions (4:48) .

13.  Practice: Combine the rational expressions.  Problems such as  (4 problems)