We look at the division of 650817 by 21 
Let's see how many times 21 fits into 650817.

Step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 21

On to step 2:
65 divided by 21 is 3 with a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 63 from 65 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 21

Step 3:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we subtract 0 from 20, we get 20.
Take the next digit (8) from the dividend and append it to 20, then repeat: 208 / 21

Step 4:
When dividing 208 by 21, we get 9 with a remainder of 19.
Put 9 as the next digit of the answer. 
Result so far: 309.0
If we subtract 189 from 208, we get 19.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 21

Let's proceed to step 5:
191 divided by 21 is 9 with a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 3099.0
If we subtract 189 from 191, we get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 21

On to step 6:
21 goes into 27 1 times with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 30991.0
Subtracting 21 from 27 leaves us 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.

Going ahead to step 7:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 30991.2
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.

Step 8:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 30991.28
The remainder is 12 after subtracting 168 from 180.
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 9:
21 goes into 120 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 30991.285
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.

Let's proceed to step 10:
When dividing 150 by 21, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 30991.2857
Deduct 147 from 150 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.

Advancing to step 11:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 30991.28571
Deduct 21 from 30 and we're left 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.

Advancing to step 12:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 30991.285714
If we take 84 away from 90, we end up 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.

On to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 30991.2857142
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 14:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 30991.28571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 30991.28571428 with a remainder of 1.2e-08.