We divide 831338 by 21
Let's see how many times 21 fits into 831338.

Step 1:
8 divided by 21 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 21

Advancing to step 2:
The number 21 fits into 83 3 times, leaving a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 63 from 83, we get 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 21

Step 3:
The number 21 fits into 201 9 times, leaving a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtract 189 from 201 to get 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 21

On to step 4:
123 divided by 21 is 5 with a remainder of 18.
Put 5 as the next digit of the answer. 
Result so far: 395.0
If we take 105 away from 123, we end up with 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 21

Moving on to step 5:
183 divided by 21 is 8 with a remainder of 15.
Use 8 as the next digit of our solution. 
Result so far: 3958.0
The remainder is 15 after subtracting 168 from 183.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 21

Advancing to step 6:
When dividing 158 by 21, we get 7 with a remainder of 11.
Write down 7 as next digit of the result. 
Result so far: 39587.0
The remainder is 11 after subtracting 147 from 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
When dividing 110 by 21, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 39587.5
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.

Step 8:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 39587.52
Subtract 42 from 50 to 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.

Going ahead to step 9:
21 goes into 80 3 times with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 39587.523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 10:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 39587.5238
Deduct 168 from 170 and we're left 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.

Advancing to step 11:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 39587.5238
Subtract 0 from 20 to 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:
200 divided by 21 is 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 39587.523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 13:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 39587.5238095
If we subtract 105 from 110, we 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.
Use 2 as the next digit of our solution. 
Result so far: 39587.52380952
Subtract 42 from 50 to 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 result is 39587.52380952 with a remainder of 8e-09.