Let's divide 19998089 by 900
The aim is to understand the frequency of 900 in 19998089.

Going ahead to step 1:
The number 900 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 900

On to step 2:
900 can be fit into 19 0 times, resulting in a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 19, we get 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 900

Advancing to step 3:
The number 900 fits into 199 0 times, leaving a remainder of 199.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 199 to get 199.
Take the next digit (9) from the dividend and append it to 199, then repeat: 1999 / 900

Going ahead to step 4:
900 goes into 1999 2 times with a remainder of 199.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 1800 away from 1999, we end up with 199.
Bring next digit (8) of the dividend behind the 199 and repeat the process: 1998 / 900

Let's proceed to step 5:
1998 divided by 900 is 2 with a remainder of 198.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
The remainder is 198 after subtracting 1800 from 1998.
Include the next digit (0) from the dividend after 198, then repeat: 1980 / 900

Let's proceed to step 6:
If we divide 1980 by 900, we get 2 and a remainder of 180.
Record the quotient 2 as the next digit in the result. 
Result so far: 222.0
If we take 1800 away from 1980, we end up with 180.
Include the next digit (8) from the dividend after 180, then repeat: 1808 / 900

Going ahead to step 7:
900 goes into 1808 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2222.0
The remainder is 8 after subtracting 1800 from 1808.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 900

Moving on to step 8:
900 can be fit into 89 0 times, resulting in a remainder of 89.
Use 0 as the next digit of our solution. 
Result so far: 22220.0
If we subtract 0 from 89, we get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 9:
900 goes into 890 0 times with a remainder of 890.
The next digit of our result is 0. 
Result so far: 22220.0
Subtract 0 from 890 to get 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8900, and continue the process.

Moving on to step 10:
900 goes into 8900 9 times with a remainder of 800.
The number 9 becomes the next digit in our result. 
Result so far: 22220.09
Subtract 8100 from 8900 to get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Advancing to step 11:
900 can be fit into 8000 8 times, resulting in a remainder of 800.
The number 8 becomes the next digit in our result. 
Result so far: 22220.098
If we subtract 7200 from 8000, we get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

On to step 12:
900 can be fit into 8000 8 times, resulting in a remainder of 800.
Put 8 as the next digit of the answer. 
Result so far: 22220.0988
Deduct 7200 from 8000 and we're left with 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Our division results in 22220.0988 with a remaining 0.008.