Why is the "Ladder Method" not taught in elementary school? Thinking about the least common multiple and what we really want to teach in arithmetic

Problems finding the least common multiple.For example,"Let's find the least common multiple of 6 and 8."In elementary school ...
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Least common denominator (LCD) think about it

In this video I will explain how to identify the least common denominator between two fractions and then between two rational expressions. We will use the same technique and understanding of factors ...