We're dividing 170821 by 80 
Let's see how many times 80 fits into 170821.

Advancing to step 1:
80 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 80

On to step 2:
80 can be fit into 17 0 times, resulting in a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 80

Let's proceed to step 3:
When dividing 170 by 80, we get 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 160 from 170 and we're left with 10.
Fetch the next digit (8) from the dividend, attach it to 10 and continue: 108 / 80

Step 4:
When dividing 108 by 80, we get 1 with a remainder of 28.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtracting 80 from 108 leaves us with 28.
Grab the next digit (2) from the dividend, add it to 28, then carry on: 282 / 80

Moving on to step 5:
282 divided by 80 is 3 with a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 213.0
Deduct 240 from 282 and we're left with 42.
Fetch the next digit (1) from the dividend, attach it to 42 and continue: 421 / 80

Step 6:
421 divided by 80 is 5 with a remainder of 21.
Write down 5 as next digit of the result. 
Result so far: 2135.0
If we take 400 away from 421, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
210 divided by 80 is 2 with a remainder of 50.
Use 2 as the next digit of our solution. 
Result so far: 2135.2
Deduct 160 from 210 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
If we divide 500 by 80, we get 6 and a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 2135.26
Deduct 480 from 500 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.

Going ahead to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 2135.262
If we subtract 160 from 200, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
If we divide 400 by 80, we get 5 and a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 2135.2625
Subtract 400 from 400 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 11:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 2135.2625
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 12:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2135.2625
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 2135.2625 with a balance of 0.0.