We're dividing 631580 by 99 
The aim is to understand the frequency of 99 in 631580.

Step 1:
The number 99 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 99

Step 2:
99 goes into 63 0 times with a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Grab the next digit (1) from the dividend, add it to 63, then carry on: 631 / 99

Going ahead to step 3:
631 divided by 99 is 6 with a remainder of 37.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we take 594 away from 631, we end up with 37.
Fetch the next digit (5) from the dividend, attach it to 37 and continue: 375 / 99

Step 4:
375 divided by 99 is 3 with a remainder of 78.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
If we subtract 297 from 375, we get 78.
Include the next digit (8) from the dividend after 78, then repeat: 788 / 99

Advancing to step 5:
If we divide 788 by 99, we get 7 and a remainder of 95.
The next digit of our result is 7. 
Result so far: 637.0
Subtract 693 from 788 to get 95.
Grab the next digit (0) from the dividend, add it to 95, then carry on: 950 / 99

Advancing to step 6:
99 can be fit into 950 9 times, resulting in a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 6379.0
Subtract 891 from 950 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 7:
If we divide 590 by 99, we get 5 and a remainder of 95.
Put 5 as the next digit of the answer. 
Result so far: 6379.5
If we take 495 away from 590, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Let's proceed to step 8:
The number 99 fits into 950 9 times, leaving a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 6379.59
Deduct 891 from 950 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 9:
99 goes into 590 5 times with a remainder of 95.
The number 5 becomes the next digit in our result. 
Result so far: 6379.595
The remainder is 95 after subtracting 495 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 10:
If we divide 950 by 99, we get 9 and a remainder of 59.
The number 9 becomes the next digit in our result. 
Result so far: 6379.5959
Subtracting 891 from 950 leaves us with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 11:
99 can be fit into 590 5 times, resulting in a remainder of 95.
The number 5 becomes the next digit in our result. 
Result so far: 6379.59595
Subtract 495 from 590 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 12:
950 divided by 99 is 9 with a remainder of 59.
Write down 9 as next digit of the result. 
Result so far: 6379.595959
Deduct 891 from 950 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 13:
99 can be fit into 590 5 times, resulting in a remainder of 95.
The next digit of our result is 5. 
Result so far: 6379.5959595
Subtracting 495 from 590 leaves us with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Step 14:
99 can be fit into 950 9 times, resulting in a remainder of 59.
Record the quotient 9 as the next digit in the result. 
Result so far: 6379.59595959
Subtracting 891 from 950 leaves us with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

The quotient of the division is 6379.59595959, and the remainder is 5.9e-08.