We divide 111830 by 90
The aim is to understand the frequency of 90 in 111830.

Let's proceed to step 1:
90 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 90

Let's proceed to step 2:
The number 90 fits into 11 0 times, leaving a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 11, we get 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 90

Moving on to step 3:
The number 90 fits into 111 1 times, leaving a remainder of 21.
The next digit of our result is 1. 
Result so far: 1.0
If we take 90 away from 111, we end up with 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 90

Let's proceed to step 4:
When dividing 218 by 90, we get 2 with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 38 after subtracting 180 from 218.
Append the next digit (3) from the dividend to 38 and continue with: 383 / 90

Let's proceed to step 5:
383 divided by 90 is 4 with a remainder of 23.
The number 4 becomes the next digit in our result. 
Result so far: 124.0
Deduct 360 from 383 and we're left with 23.
Include the next digit (0) from the dividend after 23, then repeat: 230 / 90

Going ahead to step 6:
90 can be fit into 230 2 times, resulting in a remainder of 50.
The number 2 becomes the next digit in our result. 
Result so far: 1242.0
The remainder is 50 after subtracting 180 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 7:
90 goes into 500 5 times with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 1242.5
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
If we divide 500 by 90, we get 5 and a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 1242.55
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final result is 1242.55 with a remainder of 0.05.