305438 divided by 12 
We want to divide 305438 by 12.

Step 1:
If we divide 3 by 12, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 12

Step 2:
If we divide 30 by 12, we get 2 and a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 24 from 30, we get 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 12

Going ahead to step 3:
12 can be fit into 65 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 25.0
If we take 60 away from 65, we end up with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 12

Let's proceed to step 4:
54 divided by 12 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 254.0
Subtracting 48 from 54 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 12

Advancing to step 5:
12 can be fit into 63 5 times, resulting in a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 2545.0
If we take 60 away from 63, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 12

Moving on to step 6:
38 divided by 12 is 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 25453.0
If we take 36 away from 38, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
When dividing 20 by 12, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 25453.1
The remainder is 8 after subtracting 12 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 25453.16
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.

Moving on to step 9:
When dividing 80 by 12, we get 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 25453.166
The remainder is 8 after subtracting 72 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 25453.166, with a leftover of 0.0008.