We divide 837875 by 90
The aim is to understand the frequency of 90 in 837875.

Moving on to step 1:
If we divide 8 by 90, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 90

Advancing to step 2:
83 divided by 90 is 0 with a remainder of 83.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 83 to get 83.
Grab the next digit (7) from the dividend, add it to 83, then carry on: 837 / 90

Let's proceed to step 3:
The number 90 fits into 837 9 times, leaving a remainder of 27.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 27 after subtracting 810 from 837.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 90

Moving on to step 4:
90 can be fit into 278 3 times, resulting in a remainder of 8.
The next digit of our result is 3. 
Result so far: 93.0
The remainder is 8 after subtracting 270 from 278.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 90

Moving on to step 5:
90 goes into 87 0 times with a remainder of 87.
Record the quotient 0 as the next digit in the result. 
Result so far: 930.0
If we take 0 away from 87, we end up with 87.
Grab the next digit (5) from the dividend, add it to 87, then carry on: 875 / 90

Moving on to step 6:
875 divided by 90 is 9 with a remainder of 65.
The number 9 becomes the next digit in our result. 
Result so far: 9309.0
Subtracting 810 from 875 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 7:
The number 90 fits into 650 7 times, leaving a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 9309.7
Deduct 630 from 650 and we're left 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.

On to step 8:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 9309.72
Deduct 180 from 200 and we're left 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.

Moving on to step 9:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 9309.722
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.

Our division results in 9309.722 with a remaining 0.002.