We divide 830372 by 21
Let's see how many times 21 fits into 830372.

Going ahead to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 21

On to step 2:
If we divide 83 by 21, we get 3 and a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 20 after subtracting 63 from 83.
Include the next digit (0) from the dividend after 20, then repeat: 200 / 21

Advancing to step 3:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we take 189 away from 200, we end up with 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 21

Let's proceed to step 4:
When dividing 113 by 21, we get 5 with a remainder of 8.
The next digit of our result is 5. 
Result so far: 395.0
Subtracting 105 from 113 leaves us with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 21

Advancing to step 5:
21 can be fit into 87 4 times, resulting in a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 3954.0
Deduct 84 from 87 and we're left with 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 21

Let's proceed to step 6:
The number 21 fits into 32 1 times, leaving a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 39541.0
The remainder is 11 after subtracting 21 from 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
21 goes into 110 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 39541.5
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
When dividing 50 by 21, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 39541.52
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
When dividing 80 by 21, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 39541.523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 10:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 39541.5238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 11:
If we divide 20 by 21, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 39541.5238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 12:
When dividing 200 by 21, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 39541.523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 13:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 39541.5238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
50 divided by 21 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 39541.52380952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 39541.52380952, with a leftover of 8e-09.