99990806 divided by 489 
The aim is to understand the frequency of 489 in 99990806.

Let's proceed to step 1:
489 can be fit into 9 0 times, resulting in 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 / 489

Going ahead to step 2:
99 divided by 489 is 0 with a remainder of 99.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Include the next digit (9) from the dividend after 99, then repeat: 999 / 489

On to step 3:
When dividing 999 by 489, we get 2 with a remainder of 21.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 978 from 999 to get 21.
Fetch the next digit (9) from the dividend, attach it to 21 and continue: 219 / 489

Moving on to step 4:
The number 489 fits into 219 0 times, leaving a remainder of 219.
Use 0 as the next digit of our solution. 
Result so far: 20.0
Subtracting 0 from 219 leaves us with 219.
Include the next digit (0) from the dividend after 219, then repeat: 2190 / 489

Let's proceed to step 5:
489 can be fit into 2190 4 times, resulting in a remainder of 234.
Use 4 as the next digit of our solution. 
Result so far: 204.0
If we subtract 1956 from 2190, we get 234.
Take the next digit (8) from the dividend and append it to 234, then repeat: 2348 / 489

Step 6:
2348 divided by 489 is 4 with a remainder of 392.
Put 4 as the next digit of the answer. 
Result so far: 2044.0
Subtract 1956 from 2348 to get 392.
Bring next digit (0) of the dividend behind the 392 and repeat the process: 3920 / 489

Going ahead to step 7:
3920 divided by 489 is 8 with a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 20448.0
The remainder is 8 after subtracting 3912 from 3920.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 489

Step 8:
489 can be fit into 86 0 times, resulting in a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 204480.0
The remainder is 86 after subtracting 0 from 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 9:
If we divide 860 by 489, we get 1 and a remainder of 371.
Record the quotient 1 as the next digit in the result. 
Result so far: 204480.1
Subtracting 489 from 860 leaves us with 371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Moving on to step 10:
If we divide 3710 by 489, we get 7 and a remainder of 287.
The next digit of our result is 7. 
Result so far: 204480.17
If we subtract 3423 from 3710, we get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

On to step 11:
If we divide 2870 by 489, we get 5 and a remainder of 425.
Put 5 as the next digit of the answer. 
Result so far: 204480.175
If we take 2445 away from 2870, we end up with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Going ahead to step 12:
489 can be fit into 4250 8 times, resulting in a remainder of 338.
The number 8 becomes the next digit in our result. 
Result so far: 204480.1758
Deduct 3912 from 4250 and we're left with 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

On to step 13:
489 goes into 3380 6 times with a remainder of 446.
Put 6 as the next digit of the answer. 
Result so far: 204480.17586
Deduct 2934 from 3380 and we're left with 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

On to step 14:
489 goes into 4460 9 times with a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 204480.175869
The remainder is 59 after subtracting 4401 from 4460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 15:
489 can be fit into 590 1 times, resulting in a remainder of 101.
Write down 1 as next digit of the result. 
Result so far: 204480.1758691
If we take 489 away from 590, we end up with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Step 16:
The number 489 fits into 1010 2 times, leaving a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 204480.17586912
Subtracting 978 from 1010 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Our division results in 204480.17586912 with a remaining 3.2e-08.