Divisible by 3
Sum of the digits is divisible by 3
Divisible by 4
Last two digits divisible by 4
Divisible by 5
Last digit 5 or 0
Divisible by 6
number divisible by 2 and 3
Divisible by 7
double the last digit, subtract it from the rest, the answer will be 0 or Divisible by 7
Divisible by 8
Last 3 digits Divisible by 8
Divisible by 9
Sum of digits Divisible by 9
Divisible by 10
ends in 0
Divisible by 11
add every second digit and subtract all other digits and the answer is either 0 or Divisible by 11
Divisible by 12
Divisible by 3 and 4
Divisible by 2
If last digit is even