Test 18 for Divisibility by 9

Given Number: 18
Test a Number for Divisibility by Nine (9):
• A Number is divisible by 9 if the Sum of the Digits in the Number is divisible by 9
Sum of the Digits in 18: 1+8 = 9
9 is divisible by 9, 9 ÷ 9 = 1
Therefore, 18 is divisible by 9
Notes:

• 18 ÷ 9 = 2
• Since 3 is a factor of 9, 18 is also divisible by 3