Examples: 111, 1+1+1=3; 12, 1+2=3; 30, 3+0=3.
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Oh, dude, a factor of the sum of the digits being 3 or a multiple of 3 just means that if you add up all the digits in a number and it equals 3, or if that sum is a multiple of 3, then that number has a factor that fits the bill. So, like, if you have a number where the digits add up to 3, or 6, or 9, or any multiple of 3, you've got yourself a match! It's like finding a snack in your pantry that fits your cravings perfectly – it just works out, man.
A number is divisible by 3 if the sum of its digits is divisible by 3.
If the sum of the digits of a number is divisible by 3, then the number is divisible by 3.
Yes, it is. Your answer is 406. You can determine whether a number is divisible by 3 by adding the digits. If the sum of the digits (in the above, 1+2+1+8 = 12) equals 3, the number is divisible by 3.
24 divided by three equals 8 divided by four equals 6 2 plus 4 equals 6