763983 divided by 21 
Our goal is to divide 763983 by 21.

On to step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 21

Let's proceed to step 2:
21 goes into 76 3 times with a remainder of 13.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 13 after subtracting 63 from 76.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

Moving on to step 3:
133 divided by 21 is 6 with a remainder of 7.
The next digit of our result is 6. 
Result so far: 36.0
If we take 126 away from 133, we end up with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 21

Let's proceed to step 4:
21 goes into 79 3 times with a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 363.0
If we take 63 away from 79, we end up with 16.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 21

Moving on to step 5:
The number 21 fits into 168 8 times, leaving a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 3638.0
If we subtract 168 from 168, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 21

On to step 6:
21 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 36380.0
Deduct 0 from 3 and we're left 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.

Going ahead to step 7:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 36380.1
Subtract 21 from 30 to get 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 8:
When dividing 90 by 21, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 36380.14
If we subtract 84 from 90, we 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.

Let's proceed to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 36380.142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 10:
If we divide 180 by 21, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 36380.1428
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.

Going ahead to step 11:
120 divided by 21 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 36380.14285
Subtracting 105 from 120 leaves us 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.

On to step 12:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 36380.142857
Subtracting 147 from 150 leaves us 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.

On to step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 36380.1428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 14:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 36380.14285714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 36380.14285714 with a balance of 6e-09.