Question

Which of the following is the divisibility rule for 9?

Options

• A number is divisible by 9 if its last digit is 0 or 9

• A number is divisible by 9 if the sum of its digits is divisible by 9

• A number is divisible by 9 if it is divisible by 3 and 2

• A number is divisible by 9 if all its digits are the same

Answer 1

A number is divisible by 9 if the sum of its digits is divisible by 9

Explanation:

The divisibility rule for 9 states that a number is completely divisible by 9 if and only if the sum of its digits is divisible by 9.