We're dividing 257722 by 21 
We want to divide 257722 by 21.

Going ahead to step 1:
21 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 21

Let's proceed to step 2:
21 goes into 25 1 times with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 4 after subtracting 21 from 25.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 21

Moving on to step 3:
21 goes into 47 2 times with a remainder of 5.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 42 from 47 leaves us with 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 21

Step 4:
When dividing 57 by 21, we get 2 with a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 122.0
If we take 42 away from 57, we end up with 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 21

Advancing to step 5:
21 goes into 152 7 times with a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 1227.0
If we take 147 away from 152, we end up with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 21

Advancing to step 6:
When dividing 52 by 21, we get 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 12272.0
If we take 42 away from 52, we end up with 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 7:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 12272.4
Deduct 84 from 100 and we're left 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.

Moving on to step 8:
160 divided by 21 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 12272.47
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 9:
21 goes into 130 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 12272.476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
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: 12272.4761
Subtract 21 from 40 to get 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 11:
The number 21 fits into 190 9 times, leaving a remainder of 1.
The next digit of our result is 9. 
Result so far: 12272.47619
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.

Advancing to step 12:
21 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 12272.47619
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.

On to step 13:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 12272.4761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 14:
When dividing 160 by 21, we get 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 12272.47619047
Deduct 147 from 160 and we're left 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.

Our division results in 12272.47619047 with a remaining 1.3e-08.