21308 ÷ 12 
Our goal is to divide 21308 by 12.

On to step 1:
12 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 12

Moving on to step 2:
12 goes into 21 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 12 from 21 and we're left with 9.
Take the next digit (3) from the dividend and append it to 9, then repeat: 93 / 12

Let's proceed to step 3:
When dividing 93 by 12, we get 7 with a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 17.0
If we take 84 away from 93, we end up with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 12

Going ahead to step 4:
12 can be fit into 90 7 times, resulting in a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 177.0
If we subtract 84 from 90, we get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 12

Moving on to step 5:
If we divide 68 by 12, we get 5 and a remainder of 8.
Put 5 as the next digit of the answer. 
Result so far: 1775.0
Subtracting 60 from 68 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 6:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 1775.6
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
12 can be fit into 80 6 times, resulting in a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 1775.66
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 1775.66 with a balance of 0.008.