Divisibility Test: Is 999 Divisible by 9?

To determine if the number 999 is divisible by 9, we will apply the divisibility rule for 9. According to this rule, a number is divisible by 9 if the sum of its digits is divisible by 9.

Let's work through the process:

• Step 1: Identify the digits of the number 999. They are 9, 9, and 9.
• Step 2: Calculate the sum of these digits: $9 + 9 + 9 = 27$.
• Step 3: Check if the sum (27) is divisible by 9. Since $27 \div 9 = 3$, and 27 is exactly divisible by 9, the original number 999 is also divisible by 9.

Therefore, according to the divisibility rule, the number 999 is divisible by 9.

The correct answer is Yes.