Yes.156/13 = 12
13
12. 13, if you count 200
13 is prime. It is divisible by 1 and 13.
936. All numbers divisible by 12 and 13 are multiplies of the lowest common multiple of 12 and 13 which is 156. 999 ÷ 156 = 621/52 ⇒ greatest multiple of 156 not bigger than 999 is 6 x 156 = 936.
13 and all its multiples are divisible by 13.
306 is not divisible by 13.
13
13
13
12 over 13. Common factor of 6. (Digits add to a number divisible by 3 and they are even). 12 over 13.
A number is divisible by 13 if it is a multiple of 13. In other words, 13 times a number results in a big number that is divisible by 13.