A year ago, or so, a student explained the X-Box method to me. We ended up doing the guessing method, which is what I was taught. As far as I can determine, Quora mathematicians use the guessing method. I have seen the X-Box used once. I just thought you might like to see the X-Box. Though the guessing method is fast, with practice, the X-Box works, and now I like it. Even more, I like Mr. Fuller’s advice: do your best and forget the rest.
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