1. Adding and Subtracting Rational Expressions
Focus on Algebra 2
Mrs. Sinisko

2. REVIEW from middle school…..
Least common multiple (LCM)
The LCM is the product of all different factors
from each number, with each factor raised to
the greatest power that occurs in any of the
numbers.

3. Find the LCM:
1. 45, , 100

4. Find the LCM: 3.

5. Find the LCM: 4.

6. Review of Adding and Subtracting Fractions1. 2. 3.

7. Rule _______________________________
are needed when adding and subtracting
fractions.
LCD is the same as LCM!!!

8. Example 1

9. Example 2

10. Example 3

11. Example 4

12. Example 5

13. Example 6

14. Example 7

15. Example 8

16. Example 9

17. Example 10

18. Example 11

19. Example 12