512512 ÷ 99 
The aim is to understand the frequency of 99 in 512512.

Step 1:
5 divided by 99 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 99

Step 2:
The number 99 fits into 51 0 times, leaving a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Take the next digit (2) from the dividend and append it to 51, then repeat: 512 / 99

Moving on to step 3:
When dividing 512 by 99, we get 5 with a remainder of 17.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 495 away from 512, we end up with 17.
Bring next digit (5) of the dividend behind the 17 and repeat the process: 175 / 99

Advancing to step 4:
99 goes into 175 1 times with a remainder of 76.
Record the quotient 1 as the next digit in the result. 
Result so far: 51.0
Subtract 99 from 175 to get 76.
Grab the next digit (1) from the dividend, add it to 76, then carry on: 761 / 99

Moving on to step 5:
The number 99 fits into 761 7 times, leaving a remainder of 68.
The next digit of our result is 7. 
Result so far: 517.0
Subtract 693 from 761 to get 68.
Take the next digit (2) from the dividend and append it to 68, then repeat: 682 / 99

Let's proceed to step 6:
The number 99 fits into 682 6 times, leaving a remainder of 88.
The next digit of our result is 6. 
Result so far: 5176.0
Subtracting 594 from 682 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 7:
99 can be fit into 880 8 times, resulting in a remainder of 88.
Put 8 as the next digit of the answer. 
Result so far: 5176.8
The remainder is 88 after subtracting 792 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 8:
If we divide 880 by 99, we get 8 and a remainder of 88.
Write down 8 as next digit of the result. 
Result so far: 5176.88
Subtracting 792 from 880 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Our division results in 5176.88 with a remaining 0.088.