Determine whether 69 is divisible by 3

It is because 69 both has divisible numbers by 3 so it’s simple

Add the digits together and if 3 will divide evenly into the answer, it is divisible by 3

For instance:

6 + 9 = 15

15 / 3 = 5

3 divides into 15 evenly so 69 is divisible by 3