We divide 645958 by 99
The aim is to understand the frequency of 99 in 645958.

Going ahead to step 1:
99 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 99

Moving on to step 2:
99 can be fit into 64 0 times, resulting in a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Fetch the next digit (5) from the dividend, attach it to 64 and continue: 645 / 99

Let's proceed to step 3:
When dividing 645 by 99, we get 6 with a remainder of 51.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 51 after subtracting 594 from 645.
Bring next digit (9) of the dividend behind the 51 and repeat the process: 519 / 99

Advancing to step 4:
When dividing 519 by 99, we get 5 with a remainder of 24.
The next digit of our result is 5. 
Result so far: 65.0
Deduct 495 from 519 and we're left with 24.
Take the next digit (5) from the dividend and append it to 24, then repeat: 245 / 99

Let's proceed to step 5:
245 divided by 99 is 2 with a remainder of 47.
The next digit of our result is 2. 
Result so far: 652.0
Subtract 198 from 245 to get 47.
Append the next digit (8) from the dividend to 47 and continue with: 478 / 99

On to step 6:
478 divided by 99 is 4 with a remainder of 82.
Put 4 as the next digit of the answer. 
Result so far: 6524.0
Subtracting 396 from 478 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 7:
When dividing 820 by 99, we get 8 with a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 6524.8
If we take 792 away from 820, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 8:
99 can be fit into 280 2 times, resulting in a remainder of 82.
Put 2 as the next digit of the answer. 
Result so far: 6524.82
The remainder is 82 after subtracting 198 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 9:
820 divided by 99 is 8 with a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 6524.828
The remainder is 28 after subtracting 792 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 10:
280 divided by 99 is 2 with a remainder of 82.
Use 2 as the next digit of our solution. 
Result so far: 6524.8282
Subtract 198 from 280 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 11:
820 divided by 99 is 8 with a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 6524.82828
The remainder is 28 after subtracting 792 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 12:
99 goes into 280 2 times with a remainder of 82.
Use 2 as the next digit of our solution. 
Result so far: 6524.828282
If we take 198 away from 280, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 13:
99 can be fit into 820 8 times, resulting in a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 6524.8282828
If we subtract 792 from 820, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 14:
99 can be fit into 280 2 times, resulting in a remainder of 82.
Use 2 as the next digit of our solution. 
Result so far: 6524.82828282
If we take 198 away from 280, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

After the division, we end up with 6524.82828282 and a remainder of 8.2e-08.