983745 ÷ 90 
The aim is to understand the frequency of 90 in 983745.

On to step 1:
The number 90 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 90

Let's proceed to step 2:
When dividing 98 by 90, we get 1 with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 90 from 98 to get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 90

Let's proceed to step 3:
90 goes into 83 0 times with a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we take 0 away from 83, we end up with 83.
Append the next digit (7) from the dividend to 83 and continue with: 837 / 90

Let's proceed to step 4:
When dividing 837 by 90, we get 9 with a remainder of 27.
The number 9 becomes the next digit in our result. 
Result so far: 109.0
If we take 810 away from 837, we end up with 27.
Bring next digit (4) of the dividend behind the 27 and repeat the process: 274 / 90

On to step 5:
The number 90 fits into 274 3 times, leaving a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 1093.0
The remainder is 4 after subtracting 270 from 274.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 90

Moving on to step 6:
When dividing 45 by 90, we get 0 with a remainder of 45.
Put 0 as the next digit of the answer. 
Result so far: 10930.0
If we subtract 0 from 45, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 7:
When dividing 450 by 90, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10930.5
The remainder is 0 after subtracting 450 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
90 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10930.5
If we take 0 away from 0, we end up 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.

Let's proceed to step 9:
90 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10930.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 10930.5 and a remainder of 0.0.