We divide 993937 by 90
The aim is to understand the frequency of 90 in 993937.

Step 1:
90 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 90

Step 2:
90 can be fit into 99 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 90 away from 99, we end up with 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 90

On to step 3:
90 can be fit into 93 1 times, resulting in a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we take 90 away from 93, we end up with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 90

Going ahead to step 4:
The number 90 fits into 39 0 times, leaving a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 110.0
Deduct 0 from 39 and we're left with 39.
Take the next digit (3) from the dividend and append it to 39, then repeat: 393 / 90

Going ahead to step 5:
The number 90 fits into 393 4 times, leaving a remainder of 33.
The next digit of our result is 4. 
Result so far: 1104.0
The remainder is 33 after subtracting 360 from 393.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 90

Advancing to step 6:
When dividing 337 by 90, we get 3 with a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 11043.0
Subtract 270 from 337 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 7:
When dividing 670 by 90, we get 7 with a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 11043.7
The remainder is 40 after subtracting 630 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 11043.74
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
400 divided by 90 is 4 with a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 11043.744
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 11043.744, with a leftover of 0.004.