We look at the division of 998628 by 90 
The aim is to understand the frequency of 90 in 998628.

Moving on to step 1:
90 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 90

Going ahead to step 2:
The number 90 fits into 99 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 90 away from 99, we end up with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 90

On to step 3:
If we divide 98 by 90, we get 1 and a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 8 after subtracting 90 from 98.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 90

Advancing to step 4:
When dividing 86 by 90, we get 0 with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 110.0
Subtracting 0 from 86 leaves us with 86.
Append the next digit (2) from the dividend to 86 and continue with: 862 / 90

On to step 5:
90 goes into 862 9 times with a remainder of 52.
Record the quotient 9 as the next digit in the result. 
Result so far: 1109.0
If we take 810 away from 862, we end up with 52.
Include the next digit (8) from the dividend after 52, then repeat: 528 / 90

Going ahead to step 6:
90 goes into 528 5 times with a remainder of 78.
Use 5 as the next digit of our solution. 
Result so far: 11095.0
Subtracting 450 from 528 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 7:
When dividing 780 by 90, we get 8 with a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 11095.8
Subtracting 720 from 780 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
If we divide 600 by 90, we get 6 and a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 11095.86
Subtracting 540 from 600 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 9:
When dividing 600 by 90, we get 6 with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 11095.866
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 11095.866 and a remainder of 0.006.