Expii

Divisibility by 3, 9, 11, 10^k ± 1 - Expii

Let's start by explaining the divisibility rule for \(9\). Take a number, such as \(3465\). Any number can be broken down into a place value with coefficient form, like \(3465\) is $3 * 1000 + 4 * 100 + 6 .