We look at the division of 860427 by 90 
The aim is to understand the frequency of 90 in 860427.

Going ahead to step 1:
90 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 90

On to step 2:
The number 90 fits into 86 0 times, leaving a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Append the next digit (0) from the dividend to 86 and continue with: 860 / 90

Moving on to step 3:
If we divide 860 by 90, we get 9 and a remainder of 50.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we take 810 away from 860, we end up with 50.
Grab the next digit (4) from the dividend, add it to 50, then carry on: 504 / 90

Advancing to step 4:
If we divide 504 by 90, we get 5 and a remainder of 54.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
Deduct 450 from 504 and we're left with 54.
Bring next digit (2) of the dividend behind the 54 and repeat the process: 542 / 90

Going ahead to step 5:
The number 90 fits into 542 6 times, leaving a remainder of 2.
The next digit of our result is 6. 
Result so far: 956.0
Subtract 540 from 542 to get 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 90

Going ahead to step 6:
When dividing 27 by 90, we get 0 with a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 9560.0
Deduct 0 from 27 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 7:
90 goes into 270 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 9560.3
Subtract 270 from 270 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 9560.3
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
When dividing 0 by 90, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9560.3
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 9560.3 with a remaining 0.0.