We divide 938688 by 90
The aim is to understand the frequency of 90 in 938688.

Going ahead to step 1:
If we divide 9 by 90, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 90

Going ahead to step 2:
If we divide 93 by 90, we get 1 and a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 90 from 93 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 90

Advancing to step 3:
The number 90 fits into 38 0 times, leaving a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 38, we get 38.
Take the next digit (6) from the dividend and append it to 38, then repeat: 386 / 90

Advancing to step 4:
90 goes into 386 4 times with a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 104.0
If we subtract 360 from 386, we get 26.
Grab the next digit (8) from the dividend, add it to 26, then carry on: 268 / 90

Going ahead to step 5:
When dividing 268 by 90, we get 2 with a remainder of 88.
The next digit of our result is 2. 
Result so far: 1042.0
Subtract 180 from 268 to get 88.
Take the next digit (8) from the dividend and append it to 88, then repeat: 888 / 90

On to step 6:
When dividing 888 by 90, we get 9 with a remainder of 78.
Record the quotient 9 as the next digit in the result. 
Result so far: 10429.0
Deduct 810 from 888 and we're left 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.

Moving on to step 7:
The number 90 fits into 780 8 times, leaving a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 10429.8
The remainder is 60 after subtracting 720 from 780.
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:
90 can be fit into 600 6 times, resulting in a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 10429.86
If we take 540 away from 600, we end up 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 9:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 10429.866
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.

After the division, we end up with 10429.866 and a remainder of 0.006.