4 ms·
11 = add the first, third, fifth, etc.. digits, if the sum matches that for the second, fourth, sixth, etc.. then the number is divisible by 11.
by skmurphy 16y ago
11 = add the first, third, fifth, etc.. digits, if the sum matches that for the second, fourth, sixth, etc.. then the number is divisible by 11.
- TheNewAndy 16y agoNot quite: 5060 is an exception to your rule. As described before, if (even digit sum) - (odd digit sum) is divisible by 11, then the number is divisible by 11.
- skmurphy 16y agoIf you are not careful you will learn something new. Thanks for the tip.