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### Course: Algebra (all content) > Unit 13

Lesson 4: Adding & subtracting rational expressions- Intro to adding & subtracting rational expressions
- Add & subtract rational expressions: like denominators
- Add & subtract rational expressions (basic)
- Least common multiple
- Least common multiple: repeating factors
- Least common multiple
- Adding & subtracting rational expressions
- Add & subtract rational expressions: factored denominators
- Subtracting rational expressions
- Add & subtract rational expressions

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# Least common multiple: repeating factors

To find the Least Common Multiple (LCM) of two integers, follow these steps: 1) Find the prime factorization of both numbers.
2) Determine which prime factors are needed for the least common multiple (LCM) to be divisible by both numbers.
3) Multiply the necessary prime factors together to get the least common multiple (LCM). Created by Sal Khan.

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