We look at the division of 171910 by 45 
The aim is to understand the frequency of 45 in 171910.

Let's proceed to step 1:
45 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 45

Moving on to step 2:
The number 45 fits into 17 0 times, leaving a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 45

Advancing to step 3:
If we divide 171 by 45, we get 3 and a remainder of 36.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 135 away from 171, we end up with 36.
Fetch the next digit (9) from the dividend, attach it to 36 and continue: 369 / 45

Step 4:
45 can be fit into 369 8 times, resulting in a remainder of 9.
The next digit of our result is 8. 
Result so far: 38.0
Subtracting 360 from 369 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 45

Step 5:
45 can be fit into 91 2 times, resulting in a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 382.0
Subtract 90 from 91 to get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 45

Going ahead to step 6:
45 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 3820.0
If we take 0 away from 10, we end up 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.

On to step 7:
45 can be fit into 100 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 3820.2
Subtracting 90 from 100 leaves us 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:
100 divided by 45 is 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 3820.22
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 3820.22 with a remainder of 0.01.