12439628 divided by 820 
Our goal is to divide 12439628 by 820.

Moving on to step 1:
820 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 820

On to step 2:
The number 820 fits into 12 0 times, leaving a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Grab the next digit (4) from the dividend, add it to 12, then carry on: 124 / 820

Let's proceed to step 3:
If we divide 124 by 820, we get 0 and a remainder of 124.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 124 leaves us with 124.
Grab the next digit (3) from the dividend, add it to 124, then carry on: 1243 / 820

On to step 4:
820 goes into 1243 1 times with a remainder of 423.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 820 from 1243 and we're left with 423.
Grab the next digit (9) from the dividend, add it to 423, then carry on: 4239 / 820

Let's proceed to step 5:
If we divide 4239 by 820, we get 5 and a remainder of 139.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtracting 4100 from 4239 leaves us with 139.
Append the next digit (6) from the dividend to 139 and continue with: 1396 / 820

Step 6:
820 goes into 1396 1 times with a remainder of 576.
Write down 1 as next digit of the result. 
Result so far: 151.0
Subtract 820 from 1396 to get 576.
Bring next digit (2) of the dividend behind the 576 and repeat the process: 5762 / 820

On to step 7:
The number 820 fits into 5762 7 times, leaving a remainder of 22.
Use 7 as the next digit of our solution. 
Result so far: 1517.0
Subtract 5740 from 5762 to get 22.
Take the next digit (8) from the dividend and append it to 22, then repeat: 228 / 820

Going ahead to step 8:
The number 820 fits into 228 0 times, leaving a remainder of 228.
Record the quotient 0 as the next digit in the result. 
Result so far: 15170.0
If we take 0 away from 228, we end up with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Advancing to step 9:
When dividing 2280 by 820, we get 2 with a remainder of 640.
The next digit of our result is 2. 
Result so far: 15170.2
If we take 1640 away from 2280, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

On to step 10:
The number 820 fits into 6400 7 times, leaving a remainder of 660.
Record the quotient 7 as the next digit in the result. 
Result so far: 15170.27
If we subtract 5740 from 6400, we get 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

Step 11:
820 can be fit into 6600 8 times, resulting in a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 15170.278
The remainder is 40 after subtracting 6560 from 6600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
When dividing 400 by 820, we get 0 with a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 15170.278
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 13:
820 goes into 4000 4 times with a remainder of 720.
Put 4 as the next digit of the answer. 
Result so far: 15170.27804
The remainder is 720 after subtracting 3280 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7200, and continue the process.

Step 14:
820 goes into 7200 8 times with a remainder of 640.
Use 8 as the next digit of our solution. 
Result so far: 15170.278048
The remainder is 640 after subtracting 6560 from 7200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

On to step 15:
820 goes into 6400 7 times with a remainder of 660.
Record the quotient 7 as the next digit in the result. 
Result so far: 15170.2780487
Subtract 5740 from 6400 to get 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

On to step 16:
6600 divided by 820 is 8 with a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 15170.27804878
If we take 6560 away from 6600, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 15170.27804878, with a leftover of 4e-08.