We're dividing 81770039 by 820 
Our goal is to divide 81770039 by 820.

On to step 1:
8 divided by 820 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 820

Let's proceed to step 2:
820 can be fit into 81 0 times, resulting in a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Grab the next digit (7) from the dividend, add it to 81, then carry on: 817 / 820

On to step 3:
820 can be fit into 817 0 times, resulting in a remainder of 817.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 817 and we're left with 817.
Include the next digit (7) from the dividend after 817, then repeat: 8177 / 820

Advancing to step 4:
If we divide 8177 by 820, we get 9 and a remainder of 797.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Deduct 7380 from 8177 and we're left with 797.
Grab the next digit (0) from the dividend, add it to 797, then carry on: 7970 / 820

Step 5:
If we divide 7970 by 820, we get 9 and a remainder of 590.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
Deduct 7380 from 7970 and we're left with 590.
Include the next digit (0) from the dividend after 590, then repeat: 5900 / 820

Step 6:
820 can be fit into 5900 7 times, resulting in a remainder of 160.
Use 7 as the next digit of our solution. 
Result so far: 997.0
The remainder is 160 after subtracting 5740 from 5900.
Fetch the next digit (3) from the dividend, attach it to 160 and continue: 1603 / 820

Moving on to step 7:
The number 820 fits into 1603 1 times, leaving a remainder of 783.
The next digit of our result is 1. 
Result so far: 9971.0
If we subtract 820 from 1603, we get 783.
Take the next digit (9) from the dividend and append it to 783, then repeat: 7839 / 820

Moving on to step 8:
When dividing 7839 by 820, we get 9 with a remainder of 459.
The number 9 becomes the next digit in our result. 
Result so far: 99719.0
If we take 7380 away from 7839, we end up with 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4590, and continue the process.

On to step 9:
When dividing 4590 by 820, we get 5 with a remainder of 490.
Use 5 as the next digit of our solution. 
Result so far: 99719.5
Subtracting 4100 from 4590 leaves us with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Advancing to step 10:
820 can be fit into 4900 5 times, resulting in a remainder of 800.
Use 5 as the next digit of our solution. 
Result so far: 99719.55
Subtracting 4100 from 4900 leaves us with 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

The final outcome is 99719.55, with a leftover of 0.8.