We look at the division of 90355258 by 217 
The aim is to understand the frequency of 217 in 90355258.

Moving on to step 1:
If we divide 9 by 217, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 217

Advancing to step 2:
90 divided by 217 is 0 with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Fetch the next digit (3) from the dividend, attach it to 90 and continue: 903 / 217

Advancing to step 3:
When dividing 903 by 217, we get 4 with a remainder of 35.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 868 from 903, we get 35.
Bring next digit (5) of the dividend behind the 35 and repeat the process: 355 / 217

Advancing to step 4:
355 divided by 217 is 1 with a remainder of 138.
The next digit of our result is 1. 
Result so far: 41.0
Subtracting 217 from 355 leaves us with 138.
Take the next digit (5) from the dividend and append it to 138, then repeat: 1385 / 217

Step 5:
When dividing 1385 by 217, we get 6 with a remainder of 83.
Record the quotient 6 as the next digit in the result. 
Result so far: 416.0
Subtracting 1302 from 1385 leaves us with 83.
Append the next digit (2) from the dividend to 83 and continue with: 832 / 217

Step 6:
217 goes into 832 3 times with a remainder of 181.
The next digit of our result is 3. 
Result so far: 4163.0
Subtracting 651 from 832 leaves us with 181.
Bring next digit (5) of the dividend behind the 181 and repeat the process: 1815 / 217

Advancing to step 7:
217 can be fit into 1815 8 times, resulting in a remainder of 79.
Record the quotient 8 as the next digit in the result. 
Result so far: 41638.0
Subtracting 1736 from 1815 leaves us with 79.
Bring next digit (8) of the dividend behind the 79 and repeat the process: 798 / 217

Moving on to step 8:
The number 217 fits into 798 3 times, leaving a remainder of 147.
The number 3 becomes the next digit in our result. 
Result so far: 416383.0
Subtract 651 from 798 to get 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Let's proceed to step 9:
When dividing 1470 by 217, we get 6 with a remainder of 168.
Write down 6 as next digit of the result. 
Result so far: 416383.6
Subtracting 1302 from 1470 leaves us with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Advancing to step 10:
The number 217 fits into 1680 7 times, leaving a remainder of 161.
The number 7 becomes the next digit in our result. 
Result so far: 416383.67
Deduct 1519 from 1680 and we're left with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

On to step 11:
When dividing 1610 by 217, we get 7 with a remainder of 91.
Use 7 as the next digit of our solution. 
Result so far: 416383.677
If we subtract 1519 from 1610, we get 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Our division results in 416383.677 with a remaining 0.0091.