Check if a number is divisible by 3 [closed]

Answer 1

A number is divisible by 3 if the sum of it's digits is divisible by 3.

So you can add the digits and get the sum:

• if the sum is greater or equal to 10 use the same method
• if it's 3, 6, 9 then it is divisible
• if the sum is different than 3, 6, 9 then it's not divisible