Let's divide 399557 by 25
We're looking to find how many times 25 goes into 399557.

Step 1:
When dividing 3 by 25, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 25

On to step 2:
If we divide 39 by 25, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 25 from 39 leaves us with 14.
Take the next digit (9) from the dividend and append it to 14, then repeat: 149 / 25

Advancing to step 3:
25 goes into 149 5 times with a remainder of 24.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we subtract 125 from 149, we get 24.
Include the next digit (5) from the dividend after 24, then repeat: 245 / 25

On to step 4:
25 goes into 245 9 times with a remainder of 20.
The next digit of our result is 9. 
Result so far: 159.0
The remainder is 20 after subtracting 225 from 245.
Append the next digit (5) from the dividend to 20 and continue with: 205 / 25

Step 5:
If we divide 205 by 25, we get 8 and a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 1598.0
Subtracting 200 from 205 leaves us with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 25

On to step 6:
If we divide 57 by 25, we get 2 and a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 15982.0
If we subtract 50 from 57, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
25 goes into 70 2 times with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 15982.2
Deduct 50 from 70 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
200 divided by 25 is 8 with a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 15982.28
If we subtract 200 from 200, we get 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:
25 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 15982.28
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
If we divide 0 by 25, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15982.28
If we take 0 away from 0, we end up 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 final outcome is 15982.28, with a leftover of 0.0.