What is the divisibility rule for 28?

Answer 1

To determine if a number is divisible by 28, it must be divisible by both 4 and 7, since 28 is the product of these two numbers. To check for divisibility by 4, the last two digits of the number must form a number that is divisible by 4. For divisibility by 7, you can either perform direct division or apply the rule of subtracting twice the last digit from the rest of the number until you reach a manageable number. If the resulting number is divisible by 7, then the original number is also divisible by 28.