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Math question: Easiest way to find the Greatest Common Factor?
What's the easiest way to do that? Formula or something?
Trying to help my son with his math (LOL). Easy ones, like 21, 28, are not a problem, because it's easy to spot the answer (7).
But what about harder ones, like, say 28 and 84, or 46 and 138? Surely there must be a method to figuring these out! (I guess I'm NOT smarter than a fifth grader!).
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