187899 ÷ 25 
The aim is to understand the frequency of 25 in 187899.

Going ahead to step 1:
1 divided by 25 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 25

On to step 2:
The number 25 fits into 18 0 times, leaving a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Bring next digit (7) of the dividend behind the 18 and repeat the process: 187 / 25

Advancing to step 3:
If we divide 187 by 25, we get 7 and a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 175 away from 187, we end up with 12.
Take the next digit (8) from the dividend and append it to 12, then repeat: 128 / 25

On to step 4:
128 divided by 25 is 5 with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 75.0
If we subtract 125 from 128, we get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 25

On to step 5:
If we divide 39 by 25, we get 1 and a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 751.0
Deduct 25 from 39 and we're left with 14.
Bring next digit (9) of the dividend behind the 14 and repeat the process: 149 / 25

Step 6:
25 goes into 149 5 times with a remainder of 24.
Put 5 as the next digit of the answer. 
Result so far: 7515.0
If we take 125 away from 149, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
240 divided by 25 is 9 with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 7515.9
The remainder is 15 after subtracting 225 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 8:
25 can be fit into 150 6 times, resulting in a remainder of 0.
The next digit of our result is 6. 
Result so far: 7515.96
If we take 150 away from 150, 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.

Step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7515.96
If we subtract 0 from 0, 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.

Let's proceed to step 10:
If we divide 0 by 25, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7515.96
If we subtract 0 from 0, 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.

After the division, we end up with 7515.96 and a remainder of 0.0.