This document outlines divisibility rules to determine factors of numbers based on their digits. The rules are: if the ones digit is even, the number is divisible by 2; if the sum of the digits is divisible by 3, the number is divisible by 3; if the number ends in 0 or 5, it is divisible by 5; if the sum of the digits is divisible by 9, the number is divisible by 9; and if a number ends in 0, it is divisible by 10. Examples are provided for each rule.