We look at the division of 528631 by 21 
We want to divide 528631 by 21.

Step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 21

Step 2:
If we divide 52 by 21, we get 2 and a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 42 away from 52, we end up with 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 21

On to step 3:
If we divide 108 by 21, we get 5 and a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 25.0
If we take 105 away from 108, we end up with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

Moving on to step 4:
When dividing 36 by 21, we get 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 251.0
If we subtract 21 from 36, we get 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 21

Going ahead to step 5:
153 divided by 21 is 7 with a remainder of 6.
The next digit of our result is 7. 
Result so far: 2517.0
If we take 147 away from 153, we end up with 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 21

Moving on to step 6:
21 can be fit into 61 2 times, resulting in a remainder of 19.
The next digit of our result is 2. 
Result so far: 25172.0
Subtracting 42 from 61 leaves us 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.

Moving on to step 7:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 25172.9
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.

Step 8:
When dividing 10 by 21, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 25172.9
Deduct 0 from 10 and we're left 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.

Moving on to step 9:
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: 25172.904
If we take 84 away from 100, we end up 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 10:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 25172.9047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 11:
If we divide 130 by 21, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 25172.90476
If we subtract 126 from 130, we 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.

Going ahead to step 12:
If we divide 40 by 21, we get 1 and a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 25172.904761
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.

Step 13:
190 divided by 21 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 25172.9047619
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.

On to step 14:
10 divided by 21 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 25172.9047619
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.

After the division, we end up with 25172.9047619 and a remainder of 1e-08.