We look at the division of 857728 by 21 
We want to figure out the number of times 857728 can be divided by 21.

Advancing to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 21

Moving on to step 2:
If we divide 85 by 21, we get 4 and a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 84 from 85 to get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 21

Advancing to step 3:
17 divided by 21 is 0 with a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 40.0
If we take 0 away from 17, we end up with 17.
Append the next digit (7) from the dividend to 17 and continue with: 177 / 21

Going ahead to step 4:
When dividing 177 by 21, we get 8 with a remainder of 9.
Put 8 as the next digit of the answer. 
Result so far: 408.0
The remainder is 9 after subtracting 168 from 177.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 21

Let's proceed to step 5:
If we divide 92 by 21, we get 4 and a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 4084.0
Subtracting 84 from 92 leaves us with 8.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 21

On to step 6:
21 can be fit into 88 4 times, resulting in a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 40844.0
Subtract 84 from 88 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
21 goes into 40 1 times with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 40844.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 8:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 40844.19
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 9:
10 divided by 21 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 40844.19
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 40844.1904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
The number 21 fits into 160 7 times, leaving a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 40844.19047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 12:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 40844.190476
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 13:
40 divided by 21 is 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 40844.1904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 14:
If we divide 190 by 21, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 40844.19047619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 40844.19047619 and a remainder of 1e-09.