# AF3 Addition of Dissimilar Fractions (LCM by Ladder Method)

From the previous videos, we now know that to add dissimilar fractions, you have to get the **Least Common Multiple (LCM)** of their denominators. In **AF2**, we have learned how to add dissimilar fractions using the LCM by listing. In this video, we are going to learn the ladder method, a more efficient way of getting the LCM of two or more numbers. Watch the video above and learn about the ladder method. After watching the video, test your understanding by answering the exercises below.

Practice Exercises

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Answers to practice Exercises

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