Thursday, April 14, 2016

AWESOME DIVISION RULE FOR 11

If a number is divisible by eleven the difference between the sum of the digits in the even places and the sum of the digits in the odd places is 11 or 0.

EXAMPLE.

23485 is shown to be divisible by 11 because

2 + 4 + 5 = 11
3 + 8 = 11
11 - 11 = 0
and

and 60852 is shown to be divisible by 11 because
6 + 8 + 2 = 16
0 + 5 = 5
16 - 5 = 11

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