24 1.2 x 105
Oh, isn't that a happy little question! To find the two-digit numbers divisible by 3, we start by finding the first two-digit number divisible by 3, which is 12. Then, we find the last two-digit number divisible by 3, which is 99. Now, we can count how many numbers there are between 12 and 99 that are divisible by 3.
Starting at 12 and ending at 99, there are 30 two-digit numbers divisible by three.
All numbers that are divisible by 8 and 12 would also be divisible by 4.
Numbers for which the sum of the digits is divisible by 9. This is also true for 3. There are other divisibility/multiple tests for other numbers (e.g., numbers that are divisible by 5 end in 5 or 0; numbers whose last two digits are divisible by 4 are divisible by 4)
48 is divisable by 12. 12 divided by 48 is 0.25
12
numbers which are divisible by 12 are the multiples of 12: 12, 24, 26, 48, 60, 72,...
There are three such numbers: 12, 24 and 36.
There are five such numbers: 11, 12, 15, 24 and 36.
If a number is divisible by 3, and also by 4, then it is divisible by 12 - so you might use the divisibility rules for those two numbers. Although it might be simpler just to perform the division.
Itself and any multiples of 12
The list of numbers that are divisible by three is infinite. The first four are: 3, 6, 9, 12 . . .