If sum of digits of number is divisible by 3,

Then number is divisible by 3

## Example

#### Is 18 divisible by 3?

Sum of digits = 1 + 8 = 9

And 9 is divisible by 3

So, 18 is
**
divisible
**
by 3

#### Is 39 divisible by 3?

Sum of digits = 3 + 9 = 12

And 12 is divisible by 3

So, 39 is
**
divisible
**
by 3

#### Is 93 divisible by 3?

Sum of digits = 9 + 3 = 12

And 12 is divisible by 3

So, 93 is
**
divisible
**
by 3

#### Is 270 divisible by 3?

Sum of digits = 2 + 7 + 0 = 9

And 9 is divisible by 3

So, 270 is
**
divisible
**
by 3

#### Is 25 divisible by 3?

Sum of digits = 2 + 5 = 7

But 7 is not divisible by 3

So, 25 is
**
not
**
**
divisible
**
by 3

#### Is 37 divisible by 3?

Sum of digits = 3 + 7 = 10

But 10 not divisible by 3

So, 37 is
**
not divisible
**
by 3

#### Is 260 divisible by 3?

Sum of digits = 2 + 6 + 0 = 8

But 8 is not divisible by 3

So, 260 is
**
not divisible
**
by 3