Let's divide 853459 by 90
The aim is to understand the frequency of 90 in 853459.

Advancing to step 1:
90 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 90

Step 2:
90 can be fit into 85 0 times, resulting in a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Fetch the next digit (3) from the dividend, attach it to 85 and continue: 853 / 90

Going ahead to step 3:
When dividing 853 by 90, we get 9 with a remainder of 43.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 810 away from 853, we end up with 43.
Append the next digit (4) from the dividend to 43 and continue with: 434 / 90

Step 4:
When dividing 434 by 90, we get 4 with a remainder of 74.
Put 4 as the next digit of the answer. 
Result so far: 94.0
Deduct 360 from 434 and we're left with 74.
Bring next digit (5) of the dividend behind the 74 and repeat the process: 745 / 90

Let's proceed to step 5:
90 can be fit into 745 8 times, resulting in a remainder of 25.
Write down 8 as next digit of the result. 
Result so far: 948.0
Deduct 720 from 745 and we're left with 25.
Bring next digit (9) of the dividend behind the 25 and repeat the process: 259 / 90

Going ahead to step 6:
259 divided by 90 is 2 with a remainder of 79.
The next digit of our result is 2. 
Result so far: 9482.0
Subtract 180 from 259 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 7:
90 goes into 790 8 times with a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 9482.8
If we subtract 720 from 790, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 8:
90 goes into 700 7 times with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 9482.87
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 9:
The number 90 fits into 700 7 times, leaving a remainder of 70.
The next digit of our result is 7. 
Result so far: 9482.877
The remainder is 70 after subtracting 630 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 9482.877, with a leftover of 0.007.