Let's divide 103989 by 25
We want to figure out the number of times 103989 can be divided by 25.

Step 1:
25 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 25

Going ahead to step 2:
25 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 25

Let's proceed to step 3:
The number 25 fits into 103 4 times, leaving a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 100 away from 103, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 25

Moving on to step 4:
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: 41.0
If we take 25 away from 39, we end up with 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 25

Going ahead to step 5:
25 can be fit into 148 5 times, resulting in a remainder of 23.
Record the quotient 5 as the next digit in the result. 
Result so far: 415.0
The remainder is 23 after subtracting 125 from 148.
Bring next digit (9) of the dividend behind the 23 and repeat the process: 239 / 25

Advancing to step 6:
If we divide 239 by 25, we get 9 and a remainder of 14.
Put 9 as the next digit of the answer. 
Result so far: 4159.0
If we subtract 225 from 239, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 7:
If we divide 140 by 25, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 4159.5
If we subtract 125 from 140, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 8:
25 goes into 150 6 times with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 4159.56
Subtracting 150 from 150 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.

Step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4159.56
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.

Moving on to step 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4159.56
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 4159.56, with a leftover of 0.0.