We look at the division of 91139864 by 990 
The aim is to understand the frequency of 990 in 91139864.

Going ahead to step 1:
9 divided by 990 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 990

Advancing to step 2:
When dividing 91 by 990, we get 0 with a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 91 and we're left with 91.
Include the next digit (1) from the dividend after 91, then repeat: 911 / 990

Step 3:
When dividing 911 by 990, we get 0 with a remainder of 911.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 911 and we're left with 911.
Include the next digit (3) from the dividend after 911, then repeat: 9113 / 990

On to step 4:
When dividing 9113 by 990, we get 9 with a remainder of 203.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 8910 away from 9113, we end up with 203.
Bring next digit (9) of the dividend behind the 203 and repeat the process: 2039 / 990

On to step 5:
The number 990 fits into 2039 2 times, leaving a remainder of 59.
The next digit of our result is 2. 
Result so far: 92.0
If we subtract 1980 from 2039, we get 59.
Fetch the next digit (8) from the dividend, attach it to 59 and continue: 598 / 990

Going ahead to step 6:
990 can be fit into 598 0 times, resulting in a remainder of 598.
Write down 0 as next digit of the result. 
Result so far: 920.0
Subtract 0 from 598 to get 598.
Append the next digit (6) from the dividend to 598 and continue with: 5986 / 990

On to step 7:
When dividing 5986 by 990, we get 6 with a remainder of 46.
Record the quotient 6 as the next digit in the result. 
Result so far: 9206.0
Deduct 5940 from 5986 and we're left with 46.
Grab the next digit (4) from the dividend, add it to 46, then carry on: 464 / 990

Step 8:
If we divide 464 by 990, we get 0 and a remainder of 464.
The number 0 becomes the next digit in our result. 
Result so far: 92060.0
If we take 0 away from 464, we end up with 464.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Advancing to step 9:
When dividing 4640 by 990, we get 4 with a remainder of 680.
Use 4 as the next digit of our solution. 
Result so far: 92060.4
Deduct 3960 from 4640 and we're left with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Advancing to step 10:
990 goes into 6800 6 times with a remainder of 860.
Record the quotient 6 as the next digit in the result. 
Result so far: 92060.46
Subtracting 5940 from 6800 leaves us with 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8600, and continue the process.

Going ahead to step 11:
8600 divided by 990 is 8 with a remainder of 680.
Use 8 as the next digit of our solution. 
Result so far: 92060.468
If we subtract 7920 from 8600, we get 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Let's proceed to step 12:
6800 divided by 990 is 6 with a remainder of 860.
Write down 6 as next digit of the result. 
Result so far: 92060.4686
The remainder is 860 after subtracting 5940 from 6800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8600, and continue the process.

Going ahead to step 13:
If we divide 8600 by 990, we get 8 and a remainder of 680.
Use 8 as the next digit of our solution. 
Result so far: 92060.46868
The remainder is 680 after subtracting 7920 from 8600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Advancing to step 14:
The number 990 fits into 6800 6 times, leaving a remainder of 860.
The next digit of our result is 6. 
Result so far: 92060.468686
The remainder is 860 after subtracting 5940 from 6800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8600, and continue the process.

Advancing to step 15:
The number 990 fits into 8600 8 times, leaving a remainder of 680.
Write down 8 as next digit of the result. 
Result so far: 92060.4686868
Subtracting 7920 from 8600 leaves us with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Step 16:
6800 divided by 990 is 6 with a remainder of 860.
Use 6 as the next digit of our solution. 
Result so far: 92060.46868686
If we subtract 5940 from 6800, we get 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8600, and continue the process.

The final result is 92060.46868686 with a remainder of 8.6e-07.