91909517 ÷ 303 
The aim is to understand the frequency of 303 in 91909517.

Moving on to step 1:
If we divide 9 by 303, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 303

On to step 2:
When dividing 91 by 303, we get 0 with a remainder of 91.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 91 leaves us with 91.
Grab the next digit (9) from the dividend, add it to 91, then carry on: 919 / 303

Let's proceed to step 3:
If we divide 919 by 303, we get 3 and a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 909 from 919 leaves us with 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 303

Moving on to step 4:
303 goes into 100 0 times with a remainder of 100.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we take 0 away from 100, we end up with 100.
Append the next digit (9) from the dividend to 100 and continue with: 1009 / 303

Moving on to step 5:
303 goes into 1009 3 times with a remainder of 100.
The next digit of our result is 3. 
Result so far: 303.0
If we take 909 away from 1009, we end up with 100.
Take the next digit (5) from the dividend and append it to 100, then repeat: 1005 / 303

Moving on to step 6:
When dividing 1005 by 303, we get 3 with a remainder of 96.
Use 3 as the next digit of our solution. 
Result so far: 3033.0
If we take 909 away from 1005, we end up with 96.
Take the next digit (1) from the dividend and append it to 96, then repeat: 961 / 303

Going ahead to step 7:
If we divide 961 by 303, we get 3 and a remainder of 52.
Record the quotient 3 as the next digit in the result. 
Result so far: 30333.0
If we subtract 909 from 961, we get 52.
Include the next digit (7) from the dividend after 52, then repeat: 527 / 303

Advancing to step 8:
When dividing 527 by 303, we get 1 with a remainder of 224.
Put 1 as the next digit of the answer. 
Result so far: 303331.0
If we subtract 303 from 527, we get 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Advancing to step 9:
303 can be fit into 2240 7 times, resulting in a remainder of 119.
Put 7 as the next digit of the answer. 
Result so far: 303331.7
Deduct 2121 from 2240 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 10:
1190 divided by 303 is 3 with a remainder of 281.
Record the quotient 3 as the next digit in the result. 
Result so far: 303331.73
Subtracting 909 from 1190 leaves us with 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Advancing to step 11:
303 can be fit into 2810 9 times, resulting in a remainder of 83.
The number 9 becomes the next digit in our result. 
Result so far: 303331.739
Subtract 2727 from 2810 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Going ahead to step 12:
The number 303 fits into 830 2 times, leaving a remainder of 224.
Write down 2 as next digit of the result. 
Result so far: 303331.7392
Deduct 606 from 830 and we're left with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

On to step 13:
303 can be fit into 2240 7 times, resulting in a remainder of 119.
Record the quotient 7 as the next digit in the result. 
Result so far: 303331.73927
Deduct 2121 from 2240 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 14:
1190 divided by 303 is 3 with a remainder of 281.
Use 3 as the next digit of our solution. 
Result so far: 303331.739273
Subtract 909 from 1190 to get 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Advancing to step 15:
If we divide 2810 by 303, we get 9 and a remainder of 83.
Write down 9 as next digit of the result. 
Result so far: 303331.7392739
If we take 2727 away from 2810, we end up with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 16:
303 can be fit into 830 2 times, resulting in a remainder of 224.
Record the quotient 2 as the next digit in the result. 
Result so far: 303331.73927392
If we subtract 606 from 830, we get 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

The final outcome is 303331.73927392, with a leftover of 2.24e-07.