We look at the division of 657689 by 21 
We want to figure out the number of times 657689 can be divided by 21.

Let's proceed to 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
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 21

Let's proceed to step 2:
When dividing 65 by 21, we get 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 63 from 65 to get 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 21

Step 3:
If we divide 27 by 21, we get 1 and a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
The remainder is 6 after subtracting 21 from 27.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 21

Moving on to step 4:
21 can be fit into 66 3 times, resulting in a remainder of 3.
The next digit of our result is 3. 
Result so far: 313.0
Subtracting 63 from 66 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 21

Moving on to step 5:
The number 21 fits into 38 1 times, leaving a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 3131.0
Deduct 21 from 38 and we're left with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 21

Going ahead to step 6:
If we divide 179 by 21, we get 8 and a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 31318.0
If we subtract 168 from 179, we 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.

Going ahead to step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 31318.5
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.

On to 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: 31318.52
Subtracting 42 from 50 leaves us 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.

On to step 9:
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: 31318.523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 10:
21 goes into 170 8 times with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 31318.5238
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.

Moving on to step 11:
20 divided by 21 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 31318.5238
Deduct 0 from 20 and we're left 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 12:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 31318.523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 13:
110 divided by 21 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 31318.5238095
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.

Moving on to step 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 31318.52380952
If we subtract 42 from 50, we 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.

After the division, we end up with 31318.52380952 and a remainder of 8e-09.