Question

How do we check if 87 is divisible by 3?

• A. Check if the units place is odd or even.
• B. Check if the units place is 3, 6 or 9.
• C. Check if the sum of the digits is 9.
• D. Check if the sum of digits is divisible by 3.

Answer 1

The correct option is D

Check if the sum of digits is divisible by 3.

A number is divisible by 3 if the sum of its digits is divisible by 3.

Sum of the digits of 87 = $8+7=15$

15 is divisible by 3.

Hence, 87 is also divisible by 3.