We're dividing 415342 by 90 
The aim is to understand the frequency of 90 in 415342.

Moving on to step 1:
90 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 90

Going ahead to step 2:
The number 90 fits into 41 0 times, leaving a remainder of 41.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 41 and we're left with 41.
Fetch the next digit (5) from the dividend, attach it to 41 and continue: 415 / 90

Moving on to step 3:
415 divided by 90 is 4 with a remainder of 55.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 360 from 415 leaves us with 55.
Fetch the next digit (3) from the dividend, attach it to 55 and continue: 553 / 90

On to step 4:
The number 90 fits into 553 6 times, leaving a remainder of 13.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Subtracting 540 from 553 leaves us with 13.
Include the next digit (4) from the dividend after 13, then repeat: 134 / 90

Going ahead to step 5:
The number 90 fits into 134 1 times, leaving a remainder of 44.
Use 1 as the next digit of our solution. 
Result so far: 461.0
The remainder is 44 after subtracting 90 from 134.
Grab the next digit (2) from the dividend, add it to 44, then carry on: 442 / 90

Step 6:
If we divide 442 by 90, we get 4 and a remainder of 82.
Write down 4 as next digit of the result. 
Result so far: 4614.0
The remainder is 82 after subtracting 360 from 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 7:
90 can be fit into 820 9 times, resulting in a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 4614.9
If we subtract 810 from 820, 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.

Moving on to step 8:
If we divide 100 by 90, we get 1 and a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 4614.91
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.

On to step 9:
If we divide 100 by 90, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 4614.911
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 4614.911 with a remainder of 0.001.