261645 ÷ 17 
The aim is to understand the frequency of 17 in 261645.

Going ahead to step 1:
If we divide 2 by 17, we get 0 and 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 / 17

Advancing to step 2:
17 goes into 26 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 17 from 26, we get 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 17

Let's proceed to step 3:
91 divided by 17 is 5 with a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we subtract 85 from 91, we get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 17

Let's proceed to step 4:
If we divide 66 by 17, we get 3 and a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 153.0
The remainder is 15 after subtracting 51 from 66.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 17

Advancing to step 5:
17 goes into 154 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 1539.0
Subtracting 153 from 154 leaves us with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 17

Let's proceed to step 6:
If we divide 15 by 17, we get 0 and a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 15390.0
Subtract 0 from 15 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
17 goes into 150 8 times with a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 15390.8
If we take 136 away from 150, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
17 goes into 140 8 times with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 15390.88
Deduct 136 from 140 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 15390.88 and a remainder of 0.004.