845846 divided by 90 
The aim is to understand the frequency of 90 in 845846.

Going ahead to step 1:
90 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 90

Moving on to step 2:
84 divided by 90 is 0 with a remainder of 84.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 84 and we're left with 84.
Take the next digit (5) from the dividend and append it to 84, then repeat: 845 / 90

Moving on to step 3:
When dividing 845 by 90, we get 9 with a remainder of 35.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 810 from 845, we get 35.
Take the next digit (8) from the dividend and append it to 35, then repeat: 358 / 90

Going ahead to step 4:
358 divided by 90 is 3 with a remainder of 88.
Put 3 as the next digit of the answer. 
Result so far: 93.0
Subtract 270 from 358 to get 88.
Fetch the next digit (4) from the dividend, attach it to 88 and continue: 884 / 90

On to step 5:
90 goes into 884 9 times with a remainder of 74.
Write down 9 as next digit of the result. 
Result so far: 939.0
Deduct 810 from 884 and we're left with 74.
Take the next digit (6) from the dividend and append it to 74, then repeat: 746 / 90

Going ahead to step 6:
90 goes into 746 8 times with a remainder of 26.
Put 8 as the next digit of the answer. 
Result so far: 9398.0
Subtract 720 from 746 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 7:
When dividing 260 by 90, we get 2 with a remainder of 80.
Record the quotient 2 as the next digit in the result. 
Result so far: 9398.2
Subtracting 180 from 260 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.

Going ahead to step 8:
When dividing 800 by 90, we get 8 with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 9398.28
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.

Going ahead to step 9:
90 can be fit into 800 8 times, resulting in a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 9398.288
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.

After the division, we end up with 9398.288 and a remainder of 0.008.