We divide 221759 by 90
The aim is to understand the frequency of 90 in 221759.

On to step 1:
When dividing 2 by 90, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 90

Going ahead to step 2:
When dividing 22 by 90, we get 0 with a remainder of 22.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 22, we end up with 22.
Append the next digit (1) from the dividend to 22 and continue with: 221 / 90

Let's proceed to step 3:
When dividing 221 by 90, we get 2 with a remainder of 41.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 180 from 221, we get 41.
Take the next digit (7) from the dividend and append it to 41, then repeat: 417 / 90

Step 4:
90 goes into 417 4 times with a remainder of 57.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we take 360 away from 417, we end up with 57.
Append the next digit (5) from the dividend to 57 and continue with: 575 / 90

On to step 5:
90 goes into 575 6 times with a remainder of 35.
Record the quotient 6 as the next digit in the result. 
Result so far: 246.0
Deduct 540 from 575 and we're left with 35.
Bring next digit (9) of the dividend behind the 35 and repeat the process: 359 / 90

Step 6:
If we divide 359 by 90, we get 3 and a remainder of 89.
Record the quotient 3 as the next digit in the result. 
Result so far: 2463.0
Deduct 270 from 359 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Going ahead to step 7:
90 can be fit into 890 9 times, resulting in a remainder of 80.
The number 9 becomes the next digit in our result. 
Result so far: 2463.9
Deduct 810 from 890 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 8:
90 goes into 800 8 times with a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 2463.98
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 9:
90 can be fit into 800 8 times, resulting in a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 2463.988
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Our division results in 2463.988 with a remaining 0.008.