We look at the division of 80313037 by 221 
The aim is to understand the frequency of 221 in 80313037.

Advancing to step 1:
The number 221 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 221

On to step 2:
221 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Fetch the next digit (3) from the dividend, attach it to 80 and continue: 803 / 221

Advancing to step 3:
221 goes into 803 3 times with a remainder of 140.
The next digit of our result is 3. 
Result so far: 3.0
If we take 663 away from 803, we end up with 140.
Fetch the next digit (1) from the dividend, attach it to 140 and continue: 1401 / 221

Moving on to step 4:
1401 divided by 221 is 6 with a remainder of 75.
Use 6 as the next digit of our solution. 
Result so far: 36.0
Subtracting 1326 from 1401 leaves us with 75.
Append the next digit (3) from the dividend to 75 and continue with: 753 / 221

Moving on to step 5:
221 goes into 753 3 times with a remainder of 90.
Use 3 as the next digit of our solution. 
Result so far: 363.0
Subtracting 663 from 753 leaves us with 90.
Grab the next digit (0) from the dividend, add it to 90, then carry on: 900 / 221

Step 6:
221 goes into 900 4 times with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 3634.0
Subtract 884 from 900 to get 16.
Bring next digit (3) of the dividend behind the 16 and repeat the process: 163 / 221

Step 7:
221 can be fit into 163 0 times, resulting in a remainder of 163.
Record the quotient 0 as the next digit in the result. 
Result so far: 36340.0
If we take 0 away from 163, we end up with 163.
Append the next digit (7) from the dividend to 163 and continue with: 1637 / 221

On to step 8:
221 goes into 1637 7 times with a remainder of 90.
The next digit of our result is 7. 
Result so far: 363407.0
The remainder is 90 after subtracting 1547 from 1637.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 9:
When dividing 900 by 221, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 363407.4
Deduct 884 from 900 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 10:
221 goes into 160 0 times with a remainder of 160.
Put 0 as the next digit of the answer. 
Result so far: 363407.4
If we subtract 0 from 160, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 11:
1600 divided by 221 is 7 with a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 363407.407
Subtract 1547 from 1600 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 12:
When dividing 530 by 221, we get 2 with a remainder of 88.
The number 2 becomes the next digit in our result. 
Result so far: 363407.4072
Subtracting 442 from 530 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 13:
If we divide 880 by 221, we get 3 and a remainder of 217.
Use 3 as the next digit of our solution. 
Result so far: 363407.40723
The remainder is 217 after subtracting 663 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

Moving on to step 14:
221 goes into 2170 9 times with a remainder of 181.
Write down 9 as next digit of the result. 
Result so far: 363407.407239
Subtracting 1989 from 2170 leaves us with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Step 15:
221 goes into 1810 8 times with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 363407.4072398
The remainder is 42 after subtracting 1768 from 1810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 16:
420 divided by 221 is 1 with a remainder of 199.
Put 1 as the next digit of the answer. 
Result so far: 363407.40723981
If we subtract 221 from 420, we get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

The final result is 363407.40723981 with a remainder of 1.99e-07.