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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

The least common multiple (LCM) is the smallest number that two or more numbers can divide into evenly. To find the LCM, you can use the prime factorization method or list the multiples of each number. Prime factorization involves breaking down numbers into their prime factors and constructing the smallest number with all the factors. Listing multiples involves finding the smallest shared multiple. Both methods help find the LCM of numbers like 18 and 12. Created by Sal Khan.

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