Quote:
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Originally Posted by CSflim
12,321 = 111<sup>2</sup>, also 1,234,321 = 1111<sup>2</sup>, etc.
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This one is relatively easy to explain - it will work for all 1-based numbers. Consider 11:
Code:
11
x11
---------
11
11
--------
121
Every 1-based number is results in the same type of thing - just adding the number times the various factors of 10, and then sum. ie
11*11 = 11*1 + 11*10 = 121
111*111 = 111*1 + 111*10 + 111*100 = 12321