55838036 ÷ 90 
The aim is to understand the frequency of 90 in 55838036.

On to step 1:
90 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 90

Advancing to step 2:
90 can be fit into 55 0 times, resulting in a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Append the next digit (8) from the dividend to 55 and continue with: 558 / 90

Advancing to step 3:
558 divided by 90 is 6 with a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 540 from 558 and we're left with 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 90

On to step 4:
183 divided by 90 is 2 with a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 62.0
Subtract 180 from 183 to get 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 90

Going ahead to step 5:
90 goes into 38 0 times with a remainder of 38.
Put 0 as the next digit of the answer. 
Result so far: 620.0
Subtract 0 from 38 to get 38.
Grab the next digit (0) from the dividend, add it to 38, then carry on: 380 / 90

Moving on to step 6:
If we divide 380 by 90, we get 4 and a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 6204.0
If we subtract 360 from 380, we get 20.
Take the next digit (3) from the dividend and append it to 20, then repeat: 203 / 90

Going ahead to step 7:
When dividing 203 by 90, we get 2 with a remainder of 23.
The next digit of our result is 2. 
Result so far: 62042.0
If we subtract 180 from 203, we get 23.
Grab the next digit (6) from the dividend, add it to 23, then carry on: 236 / 90

Advancing to step 8:
If we divide 236 by 90, we get 2 and a remainder of 56.
Put 2 as the next digit of the answer. 
Result so far: 620422.0
If we subtract 180 from 236, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 9:
If we divide 560 by 90, we get 6 and a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 620422.6
Subtract 540 from 560 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 620422.62
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
When dividing 200 by 90, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 620422.622
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 620422.622, with a leftover of 0.002.