We divide 99305418 by 621
The aim is to understand the frequency of 621 in 99305418.

Let's proceed to step 1:
The number 621 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 621

On to step 2:
The number 621 fits into 99 0 times, leaving a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 99 after subtracting 0 from 99.
Take the next digit (3) from the dividend and append it to 99, then repeat: 993 / 621

Moving on to step 3:
If we divide 993 by 621, we get 1 and a remainder of 372.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 621 from 993 to get 372.
Fetch the next digit (0) from the dividend, attach it to 372 and continue: 3720 / 621

Going ahead to step 4:
621 goes into 3720 5 times with a remainder of 615.
The next digit of our result is 5. 
Result so far: 15.0
If we take 3105 away from 3720, we end up with 615.
Grab the next digit (5) from the dividend, add it to 615, then carry on: 6155 / 621

On to step 5:
621 can be fit into 6155 9 times, resulting in a remainder of 566.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
If we subtract 5589 from 6155, we get 566.
Bring next digit (4) of the dividend behind the 566 and repeat the process: 5664 / 621

Going ahead to step 6:
The number 621 fits into 5664 9 times, leaving a remainder of 75.
Record the quotient 9 as the next digit in the result. 
Result so far: 1599.0
The remainder is 75 after subtracting 5589 from 5664.
Append the next digit (1) from the dividend to 75 and continue with: 751 / 621

Let's proceed to step 7:
If we divide 751 by 621, we get 1 and a remainder of 130.
Write down 1 as next digit of the result. 
Result so far: 15991.0
If we take 621 away from 751, we end up with 130.
Include the next digit (8) from the dividend after 130, then repeat: 1308 / 621

On to step 8:
1308 divided by 621 is 2 with a remainder of 66.
Write down 2 as next digit of the result. 
Result so far: 159912.0
If we subtract 1242 from 1308, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 9:
660 divided by 621 is 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 159912.1
Deduct 621 from 660 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 10:
When dividing 390 by 621, we get 0 with a remainder of 390.
Use 0 as the next digit of our solution. 
Result so far: 159912.1
Subtracting 0 from 390 leaves us with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Step 11:
3900 divided by 621 is 6 with a remainder of 174.
Record the quotient 6 as the next digit in the result. 
Result so far: 159912.106
Subtract 3726 from 3900 to get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Advancing to step 12:
When dividing 1740 by 621, we get 2 with a remainder of 498.
The number 2 becomes the next digit in our result. 
Result so far: 159912.1062
Subtracting 1242 from 1740 leaves us with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Step 13:
If we divide 4980 by 621, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 159912.10628
The remainder is 12 after subtracting 4968 from 4980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
When dividing 120 by 621, we get 0 with a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 159912.10628
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 15:
If we divide 1200 by 621, we get 1 and a remainder of 579.
The number 1 becomes the next digit in our result. 
Result so far: 159912.1062801
Deduct 621 from 1200 and we're left with 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5790, and continue the process.

Going ahead to step 16:
The number 621 fits into 5790 9 times, leaving a remainder of 201.
The next digit of our result is 9. 
Result so far: 159912.10628019
If we subtract 5589 from 5790, we get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

The final result is 159912.10628019 with a remainder of 2.01e-07.