We're dividing 79110021 by 810 
We want to divide 79110021 by 810.

On to step 1:
The number 810 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 810

Moving on to step 2:
If we divide 79 by 810, we get 0 and a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 79 leaves us with 79.
Fetch the next digit (1) from the dividend, attach it to 79 and continue: 791 / 810

Step 3:
810 goes into 791 0 times with a remainder of 791.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 791, we end up with 791.
Bring next digit (1) of the dividend behind the 791 and repeat the process: 7911 / 810

Moving on to step 4:
When dividing 7911 by 810, we get 9 with a remainder of 621.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Deduct 7290 from 7911 and we're left with 621.
Bring next digit (0) of the dividend behind the 621 and repeat the process: 6210 / 810

Going ahead to step 5:
810 goes into 6210 7 times with a remainder of 540.
The next digit of our result is 7. 
Result so far: 97.0
If we subtract 5670 from 6210, we get 540.
Include the next digit (0) from the dividend after 540, then repeat: 5400 / 810

Step 6:
If we divide 5400 by 810, we get 6 and a remainder of 540.
The next digit of our result is 6. 
Result so far: 976.0
Subtracting 4860 from 5400 leaves us with 540.
Bring next digit (2) of the dividend behind the 540 and repeat the process: 5402 / 810

Advancing to step 7:
810 can be fit into 5402 6 times, resulting in a remainder of 542.
The next digit of our result is 6. 
Result so far: 9766.0
Deduct 4860 from 5402 and we're left with 542.
Fetch the next digit (1) from the dividend, attach it to 542 and continue: 5421 / 810

On to step 8:
810 goes into 5421 6 times with a remainder of 561.
The next digit of our result is 6. 
Result so far: 97666.0
Deduct 4860 from 5421 and we're left with 561.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5610, and continue the process.

Going ahead to step 9:
If we divide 5610 by 810, we get 6 and a remainder of 750.
Put 6 as the next digit of the answer. 
Result so far: 97666.6
If we take 4860 away from 5610, we end up with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Step 10:
The number 810 fits into 7500 9 times, leaving a remainder of 210.
Use 9 as the next digit of our solution. 
Result so far: 97666.69
Deduct 7290 from 7500 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Advancing to step 11:
The number 810 fits into 2100 2 times, leaving a remainder of 480.
Use 2 as the next digit of our solution. 
Result so far: 97666.692
Subtracting 1620 from 2100 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

On to step 12:
810 can be fit into 4800 5 times, resulting in a remainder of 750.
Write down 5 as next digit of the result. 
Result so far: 97666.6925
Deduct 4050 from 4800 and we're left with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Advancing to step 13:
7500 divided by 810 is 9 with a remainder of 210.
The number 9 becomes the next digit in our result. 
Result so far: 97666.69259
The remainder is 210 after subtracting 7290 from 7500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Advancing to step 14:
2100 divided by 810 is 2 with a remainder of 480.
Put 2 as the next digit of the answer. 
Result so far: 97666.692592
If we subtract 1620 from 2100, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 15:
4800 divided by 810 is 5 with a remainder of 750.
Write down 5 as next digit of the result. 
Result so far: 97666.6925925
Subtracting 4050 from 4800 leaves us with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Going ahead to step 16:
When dividing 7500 by 810, we get 9 with a remainder of 210.
The next digit of our result is 9. 
Result so far: 97666.69259259
Subtract 7290 from 7500 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

After the division, we end up with 97666.69259259 and a remainder of 2.1e-07.