When I was a kid I discovered that any two numbers whose key patterns were 'symmetrical opposites' [?] added up to a number one digit longer made up of several 1s and one zero, i.e. 7 8 9 4 5 6 1 2 3 147+963=1,110 1495+9615=11,110 1+9=10 5+5=10
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i'm pretty sure it's because the symmetric opposite number and the number itself always sum up to 10 so you'd get 10 * 1111 for a 4 digit pattern, for example
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It actually worked on square shape numbed only, not on rectangle. Like125874 is not a multiple of 11
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The post is referring only to typing the four vertices, not the entire perimeter. 1287 works.
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Only square shapes...?
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The reason it says square is the 2nd term in the proof. If not square then the 2nd term will not necessarily equal to 0.
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This should probably say “any FOUR number dialed...”
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Exactly. I tried with 6 and it didn't work. It's trying to say that the digit of a number whose digits are the "vertices" of any rectangle formed are multiples.
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yall sure 23 is a multiple of 11?
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2365 sure is.
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