We divide 737425 by 90
The aim is to understand the frequency of 90 in 737425.

Step 1:
If we divide 7 by 90, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 90

Step 2:
90 can be fit into 73 0 times, resulting in a remainder of 73.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 73, we end up with 73.
Take the next digit (7) from the dividend and append it to 73, then repeat: 737 / 90

Going ahead to step 3:
90 goes into 737 8 times with a remainder of 17.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 720 from 737 to get 17.
Fetch the next digit (4) from the dividend, attach it to 17 and continue: 174 / 90

On to step 4:
The number 90 fits into 174 1 times, leaving a remainder of 84.
Use 1 as the next digit of our solution. 
Result so far: 81.0
Subtracting 90 from 174 leaves us with 84.
Bring next digit (2) of the dividend behind the 84 and repeat the process: 842 / 90

Let's proceed to step 5:
90 goes into 842 9 times with a remainder of 32.
Record the quotient 9 as the next digit in the result. 
Result so far: 819.0
If we subtract 810 from 842, we get 32.
Include the next digit (5) from the dividend after 32, then repeat: 325 / 90

Step 6:
90 can be fit into 325 3 times, resulting in a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 8193.0
Subtract 270 from 325 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 7:
90 can be fit into 550 6 times, resulting in a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 8193.6
Subtract 540 from 550 to 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.

Advancing to step 8:
90 can be fit into 100 1 times, resulting in a remainder of 10.
The next digit of our result is 1. 
Result so far: 8193.61
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.

Moving on to step 9:
100 divided by 90 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 8193.611
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 8193.611 with a remainder of 0.001.