81220209 ÷ 170 
Our goal is to divide 81220209 by 170.

Let's proceed to step 1:
When dividing 8 by 170, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 170

Let's proceed to step 2:
170 goes into 81 0 times with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Take the next digit (2) from the dividend and append it to 81, then repeat: 812 / 170

Advancing to step 3:
812 divided by 170 is 4 with a remainder of 132.
The next digit of our result is 4. 
Result so far: 4.0
If we take 680 away from 812, we end up with 132.
Take the next digit (2) from the dividend and append it to 132, then repeat: 1322 / 170

Step 4:
When dividing 1322 by 170, we get 7 with a remainder of 132.
Use 7 as the next digit of our solution. 
Result so far: 47.0
If we take 1190 away from 1322, we end up with 132.
Fetch the next digit (0) from the dividend, attach it to 132 and continue: 1320 / 170

Let's proceed to step 5:
The number 170 fits into 1320 7 times, leaving a remainder of 130.
The number 7 becomes the next digit in our result. 
Result so far: 477.0
The remainder is 130 after subtracting 1190 from 1320.
Bring next digit (2) of the dividend behind the 130 and repeat the process: 1302 / 170

Going ahead to step 6:
The number 170 fits into 1302 7 times, leaving a remainder of 112.
The next digit of our result is 7. 
Result so far: 4777.0
Subtract 1190 from 1302 to get 112.
Append the next digit (0) from the dividend to 112 and continue with: 1120 / 170

Step 7:
When dividing 1120 by 170, we get 6 with a remainder of 100.
The next digit of our result is 6. 
Result so far: 47776.0
If we subtract 1020 from 1120, we get 100.
Take the next digit (9) from the dividend and append it to 100, then repeat: 1009 / 170

Moving on to step 8:
1009 divided by 170 is 5 with a remainder of 159.
Write down 5 as next digit of the result. 
Result so far: 477765.0
Subtract 850 from 1009 to get 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

On to step 9:
If we divide 1590 by 170, we get 9 and a remainder of 60.
Put 9 as the next digit of the answer. 
Result so far: 477765.9
Deduct 1530 from 1590 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
170 can be fit into 600 3 times, resulting in a remainder of 90.
Put 3 as the next digit of the answer. 
Result so far: 477765.93
If we subtract 510 from 600, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 11:
170 can be fit into 900 5 times, resulting in a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 477765.935
If we subtract 850 from 900, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 12:
170 can be fit into 500 2 times, resulting in a remainder of 160.
The number 2 becomes the next digit in our result. 
Result so far: 477765.9352
Subtract 340 from 500 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 13:
1600 divided by 170 is 9 with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 477765.93529
Subtract 1530 from 1600 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 14:
170 can be fit into 700 4 times, resulting in a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 477765.935294
Deduct 680 from 700 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 15:
170 can be fit into 200 1 times, resulting in a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 477765.9352941
Subtract 170 from 200 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 16:
The number 170 fits into 300 1 times, leaving a remainder of 130.
The number 1 becomes the next digit in our result. 
Result so far: 477765.93529411
Subtract 170 from 300 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

The final outcome is 477765.93529411, with a leftover of 1.3e-07.