12921619 divided by 813 
We want to divide 12921619 by 813.

Moving on to step 1:
813 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
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 813

Advancing to step 2:
The number 813 fits into 12 0 times, leaving a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 813

Going ahead to step 3:
The number 813 fits into 129 0 times, leaving a remainder of 129.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 129, we end up with 129.
Take the next digit (2) from the dividend and append it to 129, then repeat: 1292 / 813

Let's proceed to step 4:
When dividing 1292 by 813, we get 1 with a remainder of 479.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 813 from 1292 leaves us with 479.
Fetch the next digit (1) from the dividend, attach it to 479 and continue: 4791 / 813

Advancing to step 5:
813 can be fit into 4791 5 times, resulting in a remainder of 726.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 4065 from 4791 leaves us with 726.
Include the next digit (6) from the dividend after 726, then repeat: 7266 / 813

Step 6:
7266 divided by 813 is 8 with a remainder of 762.
The next digit of our result is 8. 
Result so far: 158.0
If we subtract 6504 from 7266, we get 762.
Take the next digit (1) from the dividend and append it to 762, then repeat: 7621 / 813

Moving on to step 7:
The number 813 fits into 7621 9 times, leaving a remainder of 304.
The number 9 becomes the next digit in our result. 
Result so far: 1589.0
Subtract 7317 from 7621 to get 304.
Grab the next digit (9) from the dividend, add it to 304, then carry on: 3049 / 813

Let's proceed to step 8:
813 goes into 3049 3 times with a remainder of 610.
Record the quotient 3 as the next digit in the result. 
Result so far: 15893.0
Deduct 2439 from 3049 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Moving on to step 9:
If we divide 6100 by 813, we get 7 and a remainder of 409.
The number 7 becomes the next digit in our result. 
Result so far: 15893.7
Deduct 5691 from 6100 and we're left with 409.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4090, and continue the process.

On to step 10:
813 goes into 4090 5 times with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 15893.75
Subtracting 4065 from 4090 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
When dividing 250 by 813, we get 0 with a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 15893.75
Deduct 0 from 250 and we're left with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 12:
813 can be fit into 2500 3 times, resulting in a remainder of 61.
The number 3 becomes the next digit in our result. 
Result so far: 15893.7503
Subtract 2439 from 2500 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 13:
813 can be fit into 610 0 times, resulting in a remainder of 610.
The next digit of our result is 0. 
Result so far: 15893.7503
The remainder is 610 after subtracting 0 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Advancing to step 14:
When dividing 6100 by 813, we get 7 with a remainder of 409.
Put 7 as the next digit of the answer. 
Result so far: 15893.750307
Subtract 5691 from 6100 to get 409.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4090, and continue the process.

On to step 15:
The number 813 fits into 4090 5 times, leaving a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 15893.7503075
Subtracting 4065 from 4090 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 16:
If we divide 250 by 813, we get 0 and a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 15893.7503075
Subtracting 0 from 250 leaves us with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

The final result is 15893.7503075 with a remainder of 2.5e-07.