We look at the division of 99108489 by 880 
The aim is to understand the frequency of 880 in 99108489.

Advancing to step 1:
If we divide 9 by 880, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 880

On to step 2:
The number 880 fits into 99 0 times, leaving a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 99, we end up with 99.
Bring next digit (1) of the dividend behind the 99 and repeat the process: 991 / 880

Going ahead to step 3:
If we divide 991 by 880, we get 1 and a remainder of 111.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 880 from 991 to get 111.
Take the next digit (0) from the dividend and append it to 111, then repeat: 1110 / 880

Let's proceed to step 4:
1110 divided by 880 is 1 with a remainder of 230.
Use 1 as the next digit of our solution. 
Result so far: 11.0
Deduct 880 from 1110 and we're left with 230.
Take the next digit (8) from the dividend and append it to 230, then repeat: 2308 / 880

Step 5:
880 can be fit into 2308 2 times, resulting in a remainder of 548.
Use 2 as the next digit of our solution. 
Result so far: 112.0
The remainder is 548 after subtracting 1760 from 2308.
Append the next digit (4) from the dividend to 548 and continue with: 5484 / 880

Let's proceed to step 6:
5484 divided by 880 is 6 with a remainder of 204.
Put 6 as the next digit of the answer. 
Result so far: 1126.0
If we take 5280 away from 5484, we end up with 204.
Bring next digit (8) of the dividend behind the 204 and repeat the process: 2048 / 880

Moving on to step 7:
880 goes into 2048 2 times with a remainder of 288.
The next digit of our result is 2. 
Result so far: 11262.0
Deduct 1760 from 2048 and we're left with 288.
Fetch the next digit (9) from the dividend, attach it to 288 and continue: 2889 / 880

Step 8:
2889 divided by 880 is 3 with a remainder of 249.
The number 3 becomes the next digit in our result. 
Result so far: 112623.0
Subtracting 2640 from 2889 leaves us with 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Moving on to step 9:
2490 divided by 880 is 2 with a remainder of 730.
Use 2 as the next digit of our solution. 
Result so far: 112623.2
Deduct 1760 from 2490 and we're left with 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

Step 10:
When dividing 7300 by 880, we get 8 with a remainder of 260.
Put 8 as the next digit of the answer. 
Result so far: 112623.28
Subtract 7040 from 7300 to get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 11:
880 goes into 2600 2 times with a remainder of 840.
Use 2 as the next digit of our solution. 
Result so far: 112623.282
Subtract 1760 from 2600 to get 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

On to step 12:
When dividing 8400 by 880, we get 9 with a remainder of 480.
The next digit of our result is 9. 
Result so far: 112623.2829
The remainder is 480 after subtracting 7920 from 8400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Step 13:
4800 divided by 880 is 5 with a remainder of 400.
Use 5 as the next digit of our solution. 
Result so far: 112623.28295
If we take 4400 away from 4800, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 14:
The number 880 fits into 4000 4 times, leaving a remainder of 480.
Put 4 as the next digit of the answer. 
Result so far: 112623.282954
If we subtract 3520 from 4000, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Step 15:
When dividing 4800 by 880, we get 5 with a remainder of 400.
Record the quotient 5 as the next digit in the result. 
Result so far: 112623.2829545
The remainder is 400 after subtracting 4400 from 4800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 16:
880 goes into 4000 4 times with a remainder of 480.
Put 4 as the next digit of the answer. 
Result so far: 112623.28295454
Subtract 3520 from 4000 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

The final outcome is 112623.28295454, with a leftover of 4.8e-07.