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In this lesson, we will learn how to find the greatest common factor (gcf) and least common multiple (lcm) of two numbers. These ideas are important when working with fractions, finding common denominators to add fractions, and other operations with fractions and numbers. The GCF is found by finding the factors of numbers and looking to find the largest (greatest) factor common between two numbers. Factors are simply numbers that can be divided into a number. To find the least common multiple, we just find the multiples of the given numbers and look for the smallest (least) multiple common to both lists.