520991 ÷ 25 
We want to figure out the number of times 520991 can be divided by 25.

Moving on to step 1:
The number 25 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
Subtracting 0 from 5 leaves us with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 25

Going ahead to step 2:
25 goes into 52 2 times with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 50 from 52, we get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 25

Advancing to step 3:
If we divide 20 by 25, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we subtract 0 from 20, we get 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 25

Step 4:
The number 25 fits into 209 8 times, leaving a remainder of 9.
The number 8 becomes the next digit in our result. 
Result so far: 208.0
If we subtract 200 from 209, we get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 25

Step 5:
If we divide 99 by 25, we get 3 and a remainder of 24.
Put 3 as the next digit of the answer. 
Result so far: 2083.0
The remainder is 24 after subtracting 75 from 99.
Fetch the next digit (1) from the dividend, attach it to 24 and continue: 241 / 25

Step 6:
241 divided by 25 is 9 with a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 20839.0
Deduct 225 from 241 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.

Going ahead to step 7:
25 goes into 160 6 times with a remainder of 10.
The next digit of our result is 6. 
Result so far: 20839.6
Subtract 150 from 160 to 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 8:
The number 25 fits into 100 4 times, leaving a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 20839.64
Deduct 100 from 100 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 25 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20839.64
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20839.64
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 20839.64, and the remainder is 0.0.