We look at the division of 310099 by 25 
We want to figure out the number of times 310099 can be divided by 25.

Advancing to step 1:
The number 25 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 25

On to step 2:
If we divide 31 by 25, we get 1 and a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 25 from 31 leaves us with 6.
Append the next digit (0) from the dividend to 6 and continue with: 60 / 25

Going ahead to step 3:
When dividing 60 by 25, we get 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 50 from 60 and we're left with 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 25

On to step 4:
When dividing 100 by 25, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 124.0
Subtracting 100 from 100 leaves us with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 25

On to step 5:
The number 25 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 1240.0
Subtract 0 from 9 to get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 25

Going ahead to step 6:
25 can be fit into 99 3 times, resulting in a remainder of 24.
The number 3 becomes the next digit in our result. 
Result so far: 12403.0
The remainder is 24 after subtracting 75 from 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
25 goes into 240 9 times with a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 12403.9
Subtracting 225 from 240 leaves us with 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:
When dividing 150 by 25, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 12403.96
Subtract 150 from 150 to 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 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: 12403.96
Subtract 0 from 0 to 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.

Step 10:
25 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12403.96
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.

Our division results in 12403.96 with a remaining 0.0.