Let's divide 12991904 by 810
We want to divide 12991904 by 810.

Let's proceed to step 1:
If we divide 1 by 810, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 810

Step 2:
When dividing 12 by 810, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 810

Let's proceed to step 3:
If we divide 129 by 810, we get 0 and 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.
Include the next digit (9) from the dividend after 129, then repeat: 1299 / 810

Advancing to step 4:
1299 divided by 810 is 1 with a remainder of 489.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 810 away from 1299, we end up with 489.
Bring next digit (1) of the dividend behind the 489 and repeat the process: 4891 / 810

Going ahead to step 5:
The number 810 fits into 4891 6 times, leaving a remainder of 31.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 4860 from 4891, we get 31.
Take the next digit (9) from the dividend and append it to 31, then repeat: 319 / 810

Advancing to step 6:
The number 810 fits into 319 0 times, leaving a remainder of 319.
The next digit of our result is 0. 
Result so far: 160.0
Deduct 0 from 319 and we're left with 319.
Take the next digit (0) from the dividend and append it to 319, then repeat: 3190 / 810

Step 7:
810 goes into 3190 3 times with a remainder of 760.
The number 3 becomes the next digit in our result. 
Result so far: 1603.0
Subtracting 2430 from 3190 leaves us with 760.
Include the next digit (4) from the dividend after 760, then repeat: 7604 / 810

Let's proceed to step 8:
If we divide 7604 by 810, we get 9 and a remainder of 314.
Use 9 as the next digit of our solution. 
Result so far: 16039.0
The remainder is 314 after subtracting 7290 from 7604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Let's proceed to step 9:
If we divide 3140 by 810, we get 3 and a remainder of 710.
The next digit of our result is 3. 
Result so far: 16039.3
Deduct 2430 from 3140 and we're left with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Moving on to step 10:
If we divide 7100 by 810, we get 8 and a remainder of 620.
The number 8 becomes the next digit in our result. 
Result so far: 16039.38
If we subtract 6480 from 7100, we get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Moving on to step 11:
If we divide 6200 by 810, we get 7 and a remainder of 530.
Write down 7 as next digit of the result. 
Result so far: 16039.387
Subtracting 5670 from 6200 leaves us with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Moving on to step 12:
If we divide 5300 by 810, we get 6 and a remainder of 440.
The next digit of our result is 6. 
Result so far: 16039.3876
Subtract 4860 from 5300 to get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Going ahead to step 13:
When dividing 4400 by 810, we get 5 with a remainder of 350.
Put 5 as the next digit of the answer. 
Result so far: 16039.38765
Subtract 4050 from 4400 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Step 14:
810 goes into 3500 4 times with a remainder of 260.
Write down 4 as next digit of the result. 
Result so far: 16039.387654
Deduct 3240 from 3500 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 15:
The number 810 fits into 2600 3 times, leaving a remainder of 170.
Use 3 as the next digit of our solution. 
Result so far: 16039.3876543
Deduct 2430 from 2600 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Step 16:
When dividing 1700 by 810, we get 2 with a remainder of 80.
Write down 2 as next digit of the result. 
Result so far: 16039.38765432
The remainder is 80 after subtracting 1620 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The quotient of the division is 16039.38765432, and the remainder is 8e-08.