We look at the division of 516609 by 99 
The aim is to understand the frequency of 99 in 516609.

Moving on to step 1:
99 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 99

Step 2:
When dividing 51 by 99, we get 0 with a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Include the next digit (6) from the dividend after 51, then repeat: 516 / 99

Step 3:
99 goes into 516 5 times with a remainder of 21.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 21 after subtracting 495 from 516.
Bring next digit (6) of the dividend behind the 21 and repeat the process: 216 / 99

On to step 4:
216 divided by 99 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 52.0
The remainder is 18 after subtracting 198 from 216.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 99

Let's proceed to step 5:
When dividing 180 by 99, we get 1 with a remainder of 81.
Record the quotient 1 as the next digit in the result. 
Result so far: 521.0
Subtracting 99 from 180 leaves us with 81.
Append the next digit (9) from the dividend to 81 and continue with: 819 / 99

Step 6:
When dividing 819 by 99, we get 8 with a remainder of 27.
The number 8 becomes the next digit in our result. 
Result so far: 5218.0
The remainder is 27 after subtracting 792 from 819.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 7:
The number 99 fits into 270 2 times, leaving a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 5218.2
Deduct 198 from 270 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 8:
720 divided by 99 is 7 with a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 5218.27
If we subtract 693 from 720, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 9:
The number 99 fits into 270 2 times, leaving a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 5218.272
Deduct 198 from 270 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 10:
If we divide 720 by 99, we get 7 and a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 5218.2727
Subtract 693 from 720 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 11:
99 can be fit into 270 2 times, resulting in a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 5218.27272
If we take 198 away from 270, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 12:
720 divided by 99 is 7 with a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 5218.272727
Deduct 693 from 720 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 13:
99 can be fit into 270 2 times, resulting in a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 5218.2727272
Subtract 198 from 270 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 14:
The number 99 fits into 720 7 times, leaving a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 5218.27272727
The remainder is 27 after subtracting 693 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

After the division, we end up with 5218.27272727 and a remainder of 2.7e-08.