If we a number, say, N = 765, the way to "move it over 3 spaces" is to multiply by 1000.
Then we have: 765,000 . . . then we can add on, for example, "221".
Then we have: 765221.
And THAT is how they "tack on 221" to the end of our number.
Hope that's clear enough . . . if not, please let me know, okay?
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