Given Number: 19
Test a Number for Divisibility by Three (3):
• A Number is divisible by 3 if the Sum of the Digits in the Number is divisible by 3
Sum of the Digits in 19: 1+9 = 10
10 is not divisible by 3
Therefore, 19 is NOT divisible by 3
Note: Since 19 is not divisible by 3, it follows that 19 is also not divisible by any multiple of 3 (6, 9, 12, …)
Test a Number for Divisibility by Three (3):
• A Number is divisible by 3 if the Sum of the Digits in the Number is divisible by 3
Sum of the Digits in 19: 1+9 = 10
10 is not divisible by 3
Therefore, 19 is NOT divisible by 3
Note: Since 19 is not divisible by 3, it follows that 19 is also not divisible by any multiple of 3 (6, 9, 12, …)
