829871 ÷ 21 
Our goal is to divide 829871 by 21.

Advancing to step 1:
If we divide 8 by 21, we get 0 and 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.
Append the next digit (2) from the dividend to 8 and continue with: 82 / 21

Step 2:
82 divided by 21 is 3 with a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 82, we get 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 21

Let's proceed to step 3:
If we divide 199 by 21, we get 9 and a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we take 189 away from 199, we end up with 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 21

Step 4:
When dividing 108 by 21, we get 5 with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 395.0
If we subtract 105 from 108, we get 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 21

Advancing to step 5:
21 can be fit into 37 1 times, resulting in a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 3951.0
Deduct 21 from 37 and we're left with 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 21

On to step 6:
The number 21 fits into 161 7 times, leaving a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 39517.0
Subtracting 147 from 161 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 39517.6
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 39517.66
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 39517.66 and a remainder of 0.014.