We're dividing 373978 by 99 
The aim is to understand the frequency of 99 in 373978.

Step 1:
If we divide 3 by 99, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 99

Let's proceed to step 2:
When dividing 37 by 99, we get 0 with a remainder of 37.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 37 to get 37.
Include the next digit (3) from the dividend after 37, then repeat: 373 / 99

Going ahead to step 3:
The number 99 fits into 373 3 times, leaving a remainder of 76.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 297 from 373 and we're left with 76.
Append the next digit (9) from the dividend to 76 and continue with: 769 / 99

Advancing to step 4:
The number 99 fits into 769 7 times, leaving a remainder of 76.
Use 7 as the next digit of our solution. 
Result so far: 37.0
Subtracting 693 from 769 leaves us with 76.
Bring next digit (7) of the dividend behind the 76 and repeat the process: 767 / 99

Moving on to step 5:
The number 99 fits into 767 7 times, leaving a remainder of 74.
Use 7 as the next digit of our solution. 
Result so far: 377.0
Deduct 693 from 767 and we're left with 74.
Take the next digit (8) from the dividend and append it to 74, then repeat: 748 / 99

Let's proceed to step 6:
748 divided by 99 is 7 with a remainder of 55.
Use 7 as the next digit of our solution. 
Result so far: 3777.0
Subtract 693 from 748 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 7:
99 goes into 550 5 times with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 3777.5
Subtracting 495 from 550 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 8:
When dividing 550 by 99, we get 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 3777.55
If we take 495 away from 550, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

In conclusion, the division gives 3777.55 with a balance of 0.055.