We look at the division of 781661 by 99 
The aim is to understand the frequency of 99 in 781661.

Step 1:
7 divided by 99 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 99

On to step 2:
When dividing 78 by 99, we get 0 with a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (1) from the dividend to 78 and continue with: 781 / 99

Let's proceed to step 3:
If we divide 781 by 99, we get 7 and a remainder of 88.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtracting 693 from 781 leaves us with 88.
Take the next digit (6) from the dividend and append it to 88, then repeat: 886 / 99

Moving on to step 4:
886 divided by 99 is 8 with a remainder of 94.
Put 8 as the next digit of the answer. 
Result so far: 78.0
Subtracting 792 from 886 leaves us with 94.
Include the next digit (6) from the dividend after 94, then repeat: 946 / 99

Advancing to step 5:
When dividing 946 by 99, we get 9 with a remainder of 55.
The next digit of our result is 9. 
Result so far: 789.0
If we take 891 away from 946, we end up with 55.
Fetch the next digit (1) from the dividend, attach it to 55 and continue: 551 / 99

Let's proceed to step 6:
The number 99 fits into 551 5 times, leaving a remainder of 56.
Put 5 as the next digit of the answer. 
Result so far: 7895.0
Subtracting 495 from 551 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 7:
560 divided by 99 is 5 with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 7895.5
Subtracting 495 from 560 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 8:
When dividing 650 by 99, we get 6 with a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 7895.56
Subtract 594 from 650 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 9:
If we divide 560 by 99, we get 5 and a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 7895.565
If we take 495 away from 560, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 10:
99 can be fit into 650 6 times, resulting in a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 7895.5656
If we subtract 594 from 650, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 11:
The number 99 fits into 560 5 times, leaving a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 7895.56565
Deduct 495 from 560 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 12:
The number 99 fits into 650 6 times, leaving a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 7895.565656
Deduct 594 from 650 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 13:
99 goes into 560 5 times with a remainder of 65.
The next digit of our result is 5. 
Result so far: 7895.5656565
Subtracting 495 from 560 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 14:
When dividing 650 by 99, we get 6 with a remainder of 56.
The number 6 becomes the next digit in our result. 
Result so far: 7895.56565656
Subtract 594 from 650 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Our division results in 7895.56565656 with a remaining 5.6e-08.