We divide 827916 by 21
Let's see how many times 21 fits into 827916.

On to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (2) from the dividend after 8, then repeat: 82 / 21

Advancing to step 2:
The number 21 fits into 82 3 times, leaving a remainder of 19.
The next digit of our result is 3. 
Result so far: 3.0
If we take 63 away from 82, we end up with 19.
Fetch the next digit (7) from the dividend, attach it to 19 and continue: 197 / 21

Step 3:
21 goes into 197 9 times with a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we subtract 189 from 197, we get 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 21

Step 4:
The number 21 fits into 89 4 times, leaving a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 394.0
Deduct 84 from 89 and we're left with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 21

Moving on to step 5:
21 goes into 51 2 times with a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 3942.0
If we subtract 42 from 51, we get 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 21

Advancing to step 6:
96 divided by 21 is 4 with a remainder of 12.
The next digit of our result is 4. 
Result so far: 39424.0
Subtracting 84 from 96 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
When dividing 120 by 21, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 39424.5
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
21 goes into 150 7 times with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 39424.57
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 9:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 39424.571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 10:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 39424.5714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
21 goes into 60 2 times with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 39424.57142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 12:
If we divide 180 by 21, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 39424.571428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 39424.5714285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 14:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 39424.57142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 39424.57142857, with a leftover of 3e-09.