We divide 202129 by 90
The aim is to understand the frequency of 90 in 202129.

On to step 1:
90 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 90

Let's proceed to step 2:
90 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Append the next digit (2) from the dividend to 20 and continue with: 202 / 90

Going ahead to step 3:
90 goes into 202 2 times with a remainder of 22.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 180 from 202 leaves us with 22.
Append the next digit (1) from the dividend to 22 and continue with: 221 / 90

On to step 4:
The number 90 fits into 221 2 times, leaving a remainder of 41.
Use 2 as the next digit of our solution. 
Result so far: 22.0
Subtracting 180 from 221 leaves us with 41.
Grab the next digit (2) from the dividend, add it to 41, then carry on: 412 / 90

Moving on to step 5:
If we divide 412 by 90, we get 4 and a remainder of 52.
Use 4 as the next digit of our solution. 
Result so far: 224.0
If we subtract 360 from 412, we get 52.
Grab the next digit (9) from the dividend, add it to 52, then carry on: 529 / 90

Step 6:
90 can be fit into 529 5 times, resulting in a remainder of 79.
Put 5 as the next digit of the answer. 
Result so far: 2245.0
The remainder is 79 after subtracting 450 from 529.
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:
If we divide 790 by 90, we get 8 and a remainder of 70.
Use 8 as the next digit of our solution. 
Result so far: 2245.8
Deduct 720 from 790 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 8:
When dividing 700 by 90, we get 7 with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 2245.87
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 9:
When dividing 700 by 90, we get 7 with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 2245.877
If we subtract 630 from 700, 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.

The quotient of the division is 2245.877, and the remainder is 0.007.