Let's divide 831641 by 21
We want to divide 831641 by 21.

Advancing to step 1:
8 divided by 21 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 21

Moving on to step 2:
When dividing 83 by 21, we get 3 with 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.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 21

Step 3:
If we divide 201 by 21, we get 9 and a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 39.0
Subtracting 189 from 201 leaves us with 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 21

Advancing to step 4:
126 divided by 21 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 396.0
If we take 126 away from 126, we end up with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 21

Going ahead to step 5:
21 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 3960.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 21

Going ahead to step 6:
The number 21 fits into 41 1 times, leaving a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 39601.0
If we take 21 away from 41, we end up 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.

Let's proceed to step 7:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 39601.9
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 8:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 39601.95
Subtracting 105 from 110 leaves us 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.

Step 9:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 39601.952
Deduct 42 from 50 and we're left 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.

Moving on to step 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 39601.9523
Subtracting 63 from 80 leaves us 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.

Going ahead to step 11:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 39601.95238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
21 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 39601.95238
If we take 0 away from 20, we end up 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.

On to step 13:
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: 39601.9523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 14:
110 divided by 21 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 39601.95238095
Deduct 105 from 110 and we're left 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.

The quotient of the division is 39601.95238095, and the remainder is 5e-09.