We're dividing 649644 by 21 
Let's see how many times 21 fits into 649644.

Step 1:
21 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 21

Going ahead to step 2:
If we divide 64 by 21, we get 3 and a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 1 after subtracting 63 from 64.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 21

On to step 3:
When dividing 19 by 21, we get 0 with a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 30.0
If we subtract 0 from 19, we get 19.
Grab the next digit (6) from the dividend, add it to 19, then carry on: 196 / 21

Advancing to step 4:
If we divide 196 by 21, we get 9 and a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 309.0
If we subtract 189 from 196, we get 7.
Include the next digit (4) from the dividend after 7, then repeat: 74 / 21

Let's proceed to step 5:
If we divide 74 by 21, we get 3 and a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 3093.0
If we subtract 63 from 74, we get 11.
Append the next digit (4) from the dividend to 11 and continue with: 114 / 21

Advancing to step 6:
The number 21 fits into 114 5 times, leaving a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 30935.0
Deduct 105 from 114 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.

Let's proceed to step 7:
When dividing 90 by 21, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 30935.4
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.

Let's proceed to step 8:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 30935.42
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 30935.428
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.

Moving on to step 10:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 30935.4285
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 11:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 30935.42857
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.

Advancing to step 12:
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: 30935.428571
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.

Going ahead to step 13:
When dividing 90 by 21, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 30935.4285714
The remainder is 6 after subtracting 84 from 90.
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 14:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 30935.42857142
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.

After the division, we end up with 30935.42857142 and a remainder of 1.8e-08.