We're dividing 25136 by 15 
The aim is to understand the frequency of 15 in 25136.

Going ahead to step 1:
The number 15 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 15

On to step 2:
15 goes into 25 1 times with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 15 away from 25, we end up with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 15

Moving on to step 3:
15 goes into 101 6 times with a remainder of 11.
Put 6 as the next digit of the answer. 
Result so far: 16.0
The remainder is 11 after subtracting 90 from 101.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 15

On to step 4:
The number 15 fits into 113 7 times, leaving a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 167.0
The remainder is 8 after subtracting 105 from 113.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 15

Advancing to step 5:
86 divided by 15 is 5 with a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 1675.0
Subtracting 75 from 86 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 6:
15 can be fit into 110 7 times, resulting in a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 1675.7
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
15 goes into 50 3 times with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 1675.73
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 1675.733
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 1675.733 with a remaining 0.0005.