Math puzzle explained

Here's Julio Méndez's solution to the puzzle:

Pretty neat, huh? Very few people think to try a decimal point.

But Julio is a serious mathematician. He got to playing with it. Look what he discovered:


and even

Why should this be, he wondered? By playing a minute more, he explained it thusly:

As you can see, it will work with ANY number. Cool, no? 

Thanks, Julio!

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