172986 ÷ 25 
The aim is to understand the frequency of 25 in 172986.

Going ahead to step 1:
25 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 25

Moving on to step 2:
17 divided by 25 is 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 25

Step 3:
25 goes into 172 6 times with a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 150 from 172, we get 22.
Take the next digit (9) from the dividend and append it to 22, then repeat: 229 / 25

Going ahead to step 4:
25 can be fit into 229 9 times, resulting in a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
The remainder is 4 after subtracting 225 from 229.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 25

Step 5:
25 goes into 48 1 times with a remainder of 23.
Use 1 as the next digit of our solution. 
Result so far: 691.0
If we subtract 25 from 48, we get 23.
Grab the next digit (6) from the dividend, add it to 23, then carry on: 236 / 25

Step 6:
If we divide 236 by 25, we get 9 and a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 6919.0
If we take 225 away from 236, we end up 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.

Advancing to step 7:
The number 25 fits into 110 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 6919.4
Deduct 100 from 110 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
25 can be fit into 100 4 times, resulting in a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 6919.44
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 6919.44 with a remainder of 0.0.