For example, 2 + 4 + 5+ 9 + 8+ 1 + 7 + 6 = 42; 4 + 2 = 6. ... The realm of divisibility rules has all sorts of avenues for further investigation and algorithm development.

A divisibility rule is a shorthand way of determining whether a given integer is divisible by a fixed divisor without performing the division, usually by examining its digits. Although there are ...

We know from divisibility rules that for any five digit number to be a multiple of 11, if the number is of the form: abcde, then should be equal to either 0 or a multiple of 11.