We're dividing 261698 by 15 
The aim is to understand the frequency of 15 in 261698.

On to step 1:
15 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 15

Let's proceed to step 2:
15 goes into 26 1 times with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 15 from 26 leaves us with 11.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 15

Let's proceed to step 3:
When dividing 111 by 15, we get 7 with a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Subtract 105 from 111 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 15

On to step 4:
The number 15 fits into 66 4 times, leaving a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 174.0
The remainder is 6 after subtracting 60 from 66.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 15

Advancing to step 5:
15 goes into 69 4 times with a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 1744.0
If we subtract 60 from 69, we get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 15

Let's proceed to step 6:
If we divide 98 by 15, we get 6 and a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 17446.0
The remainder is 8 after subtracting 90 from 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
When dividing 80 by 15, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 17446.5
Subtracting 75 from 80 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.

Going ahead to step 8:
When dividing 50 by 15, we get 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 17446.53
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.

On to step 9:
When dividing 50 by 15, we get 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 17446.533
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 17446.533 with a remaining 0.0005.