We're dividing 215695 by 90 
The aim is to understand the frequency of 90 in 215695.

Advancing to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 90

Going ahead to step 2:
90 can be fit into 21 0 times, resulting in a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 90

Let's proceed to step 3:
The number 90 fits into 215 2 times, leaving a remainder of 35.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 35 after subtracting 180 from 215.
Grab the next digit (6) from the dividend, add it to 35, then carry on: 356 / 90

On to step 4:
If we divide 356 by 90, we get 3 and a remainder of 86.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
If we subtract 270 from 356, we get 86.
Bring next digit (9) of the dividend behind the 86 and repeat the process: 869 / 90

Let's proceed to step 5:
The number 90 fits into 869 9 times, leaving a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 239.0
Subtract 810 from 869 to get 59.
Bring next digit (5) of the dividend behind the 59 and repeat the process: 595 / 90

Going ahead to step 6:
90 can be fit into 595 6 times, resulting in a remainder of 55.
The next digit of our result is 6. 
Result so far: 2396.0
If we subtract 540 from 595, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 7:
90 goes into 550 6 times with a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 2396.6
Subtract 540 from 550 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
The number 90 fits into 100 1 times, leaving a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 2396.61
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
If we divide 100 by 90, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 2396.611
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 2396.611 with a remainder of 0.001.