We look at the division of 21918 by 99 
The aim is to understand the frequency of 99 in 21918.

Step 1:
If we divide 2 by 99, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 99

Moving on to step 2:
21 divided by 99 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Bring next digit (9) of the dividend behind the 21 and repeat the process: 219 / 99

Moving on to step 3:
219 divided by 99 is 2 with a remainder of 21.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 198 from 219 and we're left with 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 99

Step 4:
When dividing 211 by 99, we get 2 with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 22.0
Subtracting 198 from 211 leaves us with 13.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 99

On to step 5:
The number 99 fits into 138 1 times, leaving a remainder of 39.
The next digit of our result is 1. 
Result so far: 221.0
The remainder is 39 after subtracting 99 from 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 6:
390 divided by 99 is 3 with a remainder of 93.
Write down 3 as next digit of the result. 
Result so far: 221.3
Deduct 297 from 390 and we're left with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Step 7:
99 goes into 930 9 times with a remainder of 39.
Use 9 as the next digit of our solution. 
Result so far: 221.39
Deduct 891 from 930 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 8:
99 can be fit into 390 3 times, resulting in a remainder of 93.
The number 3 becomes the next digit in our result. 
Result so far: 221.393
The remainder is 93 after subtracting 297 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Going ahead to step 9:
930 divided by 99 is 9 with a remainder of 39.
Record the quotient 9 as the next digit in the result. 
Result so far: 221.3939
Subtracting 891 from 930 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 10:
99 can be fit into 390 3 times, resulting in a remainder of 93.
Write down 3 as next digit of the result. 
Result so far: 221.39393
If we take 297 away from 390, we end up with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Step 11:
If we divide 930 by 99, we get 9 and a remainder of 39.
Use 9 as the next digit of our solution. 
Result so far: 221.393939
The remainder is 39 after subtracting 891 from 930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 12:
If we divide 390 by 99, we get 3 and a remainder of 93.
Put 3 as the next digit of the answer. 
Result so far: 221.3939393
Subtract 297 from 390 to get 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Let's proceed to step 13:
99 can be fit into 930 9 times, resulting in a remainder of 39.
The next digit of our result is 9. 
Result so far: 221.39393939
Subtract 891 from 930 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The quotient of the division is 221.39393939, and the remainder is 3.9e-08.