We look at the division of 21057086 by 525 
Our goal is to divide 21057086 by 525.

Moving on to step 1:
When dividing 2 by 525, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 525

On to step 2:
The number 525 fits into 21 0 times, leaving a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (0) from the dividend, attach it to 21 and continue: 210 / 525

Advancing to step 3:
If we divide 210 by 525, we get 0 and a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Include the next digit (5) from the dividend after 210, then repeat: 2105 / 525

Moving on to step 4:
525 can be fit into 2105 4 times, resulting in a remainder of 5.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 2100 away from 2105, we end up with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 525

Moving on to step 5:
525 can be fit into 57 0 times, resulting in a remainder of 57.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
If we take 0 away from 57, we end up with 57.
Take the next digit (0) from the dividend and append it to 57, then repeat: 570 / 525

Moving on to step 6:
The number 525 fits into 570 1 times, leaving a remainder of 45.
Record the quotient 1 as the next digit in the result. 
Result so far: 401.0
If we take 525 away from 570, we end up with 45.
Grab the next digit (8) from the dividend, add it to 45, then carry on: 458 / 525

Moving on to step 7:
525 can be fit into 458 0 times, resulting in a remainder of 458.
Record the quotient 0 as the next digit in the result. 
Result so far: 4010.0
Subtracting 0 from 458 leaves us with 458.
Append the next digit (6) from the dividend to 458 and continue with: 4586 / 525

Let's proceed to step 8:
525 goes into 4586 8 times with a remainder of 386.
Put 8 as the next digit of the answer. 
Result so far: 40108.0
Subtracting 4200 from 4586 leaves us with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Let's proceed to step 9:
525 goes into 3860 7 times with a remainder of 185.
The number 7 becomes the next digit in our result. 
Result so far: 40108.7
Deduct 3675 from 3860 and we're left with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Moving on to step 10:
The number 525 fits into 1850 3 times, leaving a remainder of 275.
Put 3 as the next digit of the answer. 
Result so far: 40108.73
The remainder is 275 after subtracting 1575 from 1850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Moving on to step 11:
The number 525 fits into 2750 5 times, leaving a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 40108.735
If we subtract 2625 from 2750, we get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 12:
The number 525 fits into 1250 2 times, leaving a remainder of 200.
Use 2 as the next digit of our solution. 
Result so far: 40108.7352
Subtracting 1050 from 1250 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 13:
525 can be fit into 2000 3 times, resulting in a remainder of 425.
The number 3 becomes the next digit in our result. 
Result so far: 40108.73523
Subtracting 1575 from 2000 leaves us with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Going ahead to step 14:
The number 525 fits into 4250 8 times, leaving a remainder of 50.
The number 8 becomes the next digit in our result. 
Result so far: 40108.735238
Subtracting 4200 from 4250 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 15:
525 goes into 500 0 times with a remainder of 500.
Use 0 as the next digit of our solution. 
Result so far: 40108.735238
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Step 16:
When dividing 5000 by 525, we get 9 with a remainder of 275.
Put 9 as the next digit of the answer. 
Result so far: 40108.73523809
Subtracting 4725 from 5000 leaves us with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

The final result is 40108.73523809 with a remainder of 2.75e-07.