We look at the division of 305793 by 90 
The aim is to understand the frequency of 90 in 305793.

Moving on to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 90

Step 2:
90 goes into 30 0 times with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Take the next digit (5) from the dividend and append it to 30, then repeat: 305 / 90

On to step 3:
If we divide 305 by 90, we get 3 and a remainder of 35.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 270 from 305 and we're left with 35.
Include the next digit (7) from the dividend after 35, then repeat: 357 / 90

Going ahead to step 4:
The number 90 fits into 357 3 times, leaving a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 33.0
Subtract 270 from 357 to get 87.
Take the next digit (9) from the dividend and append it to 87, then repeat: 879 / 90

Step 5:
90 can be fit into 879 9 times, resulting in a remainder of 69.
Write down 9 as next digit of the result. 
Result so far: 339.0
If we take 810 away from 879, we end up with 69.
Bring next digit (3) of the dividend behind the 69 and repeat the process: 693 / 90

Going ahead to step 6:
90 can be fit into 693 7 times, resulting in a remainder of 63.
Use 7 as the next digit of our solution. 
Result so far: 3397.0
If we subtract 630 from 693, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 7:
630 divided by 90 is 7 with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 3397.7
The remainder is 0 after subtracting 630 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 3397.7
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
90 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 3397.7
Deduct 0 from 0 and we're left with 0.
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 outcome is 3397.7, with a leftover of 0.0.