30921999 divided by 12 
Let's see how many times 12 fits into 30921999.

Advancing to step 1:
12 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 12

Moving on to step 2:
When dividing 30 by 12, we get 2 with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 24 away from 30, we end up with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 12

On to step 3:
The number 12 fits into 69 5 times, leaving a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 25.0
Subtracting 60 from 69 leaves us with 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 12

Step 4:
If we divide 92 by 12, we get 7 and a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 257.0
If we subtract 84 from 92, we get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 12

Step 5:
The number 12 fits into 81 6 times, leaving a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 2576.0
The remainder is 9 after subtracting 72 from 81.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 12

Let's proceed to step 6:
12 can be fit into 99 8 times, resulting in a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 25768.0
Subtracting 96 from 99 leaves us with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 12

On to step 7:
12 can be fit into 39 3 times, resulting in a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 257683.0
If we take 36 away from 39, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 12

On to step 8:
12 can be fit into 39 3 times, resulting in a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 2576833.0
The remainder is 3 after subtracting 36 from 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 9:
12 goes into 30 2 times with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 2576833.2
Subtract 24 from 30 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 10:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 2576833.25
If we take 60 away from 60, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 11:
When dividing 0 by 12, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2576833.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 12:
12 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 2576833.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 2576833.25 with a balance of 0.0.