Let's divide 15799882 by 25
The aim is to understand the frequency of 25 in 15799882.

Going ahead to step 1:
If we divide 1 by 25, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 25

Let's proceed to step 2:
When dividing 15 by 25, we get 0 with a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Fetch the next digit (7) from the dividend, attach it to 15 and continue: 157 / 25

Let's proceed to step 3:
157 divided by 25 is 6 with a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 150 from 157 leaves us with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 25

Let's proceed to step 4:
25 goes into 79 3 times with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
If we subtract 75 from 79, we get 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 25

Step 5:
When dividing 49 by 25, we get 1 with a remainder of 24.
Put 1 as the next digit of the answer. 
Result so far: 631.0
The remainder is 24 after subtracting 25 from 49.
Grab the next digit (8) from the dividend, add it to 24, then carry on: 248 / 25

Let's proceed to step 6:
If we divide 248 by 25, we get 9 and a remainder of 23.
Write down 9 as next digit of the result. 
Result so far: 6319.0
Subtract 225 from 248 to get 23.
Grab the next digit (8) from the dividend, add it to 23, then carry on: 238 / 25

Moving on to step 7:
238 divided by 25 is 9 with a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 63199.0
Subtract 225 from 238 to get 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 25

Let's proceed to step 8:
25 goes into 132 5 times with a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 631995.0
The remainder is 7 after subtracting 125 from 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 9:
When dividing 70 by 25, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 631995.2
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.

Advancing to step 10:
25 goes into 200 8 times with a remainder of 0.
The next digit of our result is 8. 
Result so far: 631995.28
The remainder is 0 after subtracting 200 from 200.
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 11:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 631995.28
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 12:
When dividing 0 by 25, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 631995.28
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.

After the division, we end up with 631995.28 and a remainder of 0.0.