672378 divided by 99 
The aim is to understand the frequency of 99 in 672378.

On to step 1:
6 divided by 99 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 99

On to step 2:
When dividing 67 by 99, we get 0 with a remainder of 67.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 67 after subtracting 0 from 67.
Append the next digit (2) from the dividend to 67 and continue with: 672 / 99

Moving on to step 3:
99 can be fit into 672 6 times, resulting in a remainder of 78.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 594 away from 672, we end up with 78.
Include the next digit (3) from the dividend after 78, then repeat: 783 / 99

Let's proceed to step 4:
If we divide 783 by 99, we get 7 and a remainder of 90.
The number 7 becomes the next digit in our result. 
Result so far: 67.0
Deduct 693 from 783 and we're left with 90.
Fetch the next digit (7) from the dividend, attach it to 90 and continue: 907 / 99

Advancing to step 5:
99 can be fit into 907 9 times, resulting in a remainder of 16.
The next digit of our result is 9. 
Result so far: 679.0
If we take 891 away from 907, we end up with 16.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 99

Moving on to step 6:
The number 99 fits into 168 1 times, leaving a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 6791.0
Subtract 99 from 168 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 7:
99 goes into 690 6 times with a remainder of 96.
The number 6 becomes the next digit in our result. 
Result so far: 6791.6
The remainder is 96 after subtracting 594 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 8:
If we divide 960 by 99, we get 9 and a remainder of 69.
The next digit of our result is 9. 
Result so far: 6791.69
If we take 891 away from 960, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 9:
When dividing 690 by 99, we get 6 with a remainder of 96.
The next digit of our result is 6. 
Result so far: 6791.696
Subtract 594 from 690 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

On to step 10:
When dividing 960 by 99, we get 9 with a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 6791.6969
Subtract 891 from 960 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 11:
When dividing 690 by 99, we get 6 with a remainder of 96.
Use 6 as the next digit of our solution. 
Result so far: 6791.69696
If we subtract 594 from 690, we get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 12:
The number 99 fits into 960 9 times, leaving a remainder of 69.
Record the quotient 9 as the next digit in the result. 
Result so far: 6791.696969
Deduct 891 from 960 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 13:
690 divided by 99 is 6 with a remainder of 96.
Put 6 as the next digit of the answer. 
Result so far: 6791.6969696
Subtracting 594 from 690 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 14:
The number 99 fits into 960 9 times, leaving a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 6791.69696969
Subtract 891 from 960 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

The final result is 6791.69696969 with a remainder of 6.9e-08.