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# The least common multiple — introduction

This is an introduction to the least common multiple of two numbers. The term itself tells you what this means: we need to check the MULTIPLES of the two numbers, find the common ones, and choose the least of those. Examples make this idea clear.

In the 2nd part, I explain two topics:

• Using the least common multiple of the denominators when adding fractions; and
• How to find the least common multiple of two numbers by using the prime factorization of the numbers.

Additionally, you can practice finding the LCM of two, three, or four numbers here (online practice).

Greates common factor — video lesson

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