We look at the division of 946817 by 90 
The aim is to understand the frequency of 90 in 946817.

Going ahead to step 1:
If we divide 9 by 90, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 90

On to step 2:
When dividing 94 by 90, we get 1 with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 90 away from 94, we end up with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 90

Let's proceed to step 3:
When dividing 46 by 90, we get 0 with a remainder of 46.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 46 leaves us with 46.
Bring next digit (8) of the dividend behind the 46 and repeat the process: 468 / 90

Going ahead to step 4:
90 goes into 468 5 times with a remainder of 18.
Record the quotient 5 as the next digit in the result. 
Result so far: 105.0
Subtract 450 from 468 to get 18.
Bring next digit (1) of the dividend behind the 18 and repeat the process: 181 / 90

Step 5:
90 goes into 181 2 times with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 1052.0
If we subtract 180 from 181, we get 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 90

Going ahead to step 6:
90 goes into 17 0 times with a remainder of 17.
The next digit of our result is 0. 
Result so far: 10520.0
Deduct 0 from 17 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 7:
When dividing 170 by 90, we get 1 with a remainder of 80.
Write down 1 as next digit of the result. 
Result so far: 10520.1
Deduct 90 from 170 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.

Moving on to step 8:
800 divided by 90 is 8 with a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 10520.18
Subtracting 720 from 800 leaves us 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.

Advancing to step 9:
If we divide 800 by 90, we get 8 and a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 10520.188
Subtract 720 from 800 to 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.

In conclusion, the division gives 10520.188 with a balance of 0.008.