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You have discovered that calculators do not always get the right answerhttps://en.wikipedia.org/wiki/Round-off_error
And BTW, I don't think it is just a phenomenon found in calculators alone. the square root of .1 is 0.3162277... (note the "16" already there). In short, the pattern is already there, for all to see. It's clearly not a fluke.
Just to be clear, I think even irrational number have simple patterns.
It doesn't just happen with these. Consider .9999... That equals one, of course. But when you do the same, you get 0.99999999994999999999874999999994. Now, you get "5" and "75" as your hidden pattern.