1. Math 51 7.3/7.4 – Rational Expressions: LCD, Adding, and Subtracting 1

2. The least common denominator (LCD) is the simplest expression that is divisible by all given denominators. To find it, write the prime factorization of each denominator, and take the most number of each factor you see. 2 LCD

3. The least common denominator (LCD) is the simplest expression that is divisible by all given denominators. To find it, write the prime factorization of each denominator, and take the most number of each factor you see. 3 LCD

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12. 12 Adding and Subtracting

13. 13 Adding and Subtracting

14. 14 Adding and Subtracting

15. 15 Adding and Subtracting

16. 16 Adding and Subtracting

17. 17 Adding and Subtracting

18. 18 Adding and Subtracting

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21. 21 Different Denominators

22. 22 Different Denominators LCD

23. 23 Different Denominators LCD 6

24. 24 Different Denominators LCD 6

25. 25 Different Denominators LCD 6

26. 26 Different Denominators LCD 6

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