55205012 ÷ 221 
The aim is to understand the frequency of 221 in 55205012.

Moving on to step 1:
221 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 221

Going ahead to step 2:
55 divided by 221 is 0 with a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 55 to get 55.
Fetch the next digit (2) from the dividend, attach it to 55 and continue: 552 / 221

Advancing to step 3:
The number 221 fits into 552 2 times, leaving a remainder of 110.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 442 from 552 to get 110.
Fetch the next digit (0) from the dividend, attach it to 110 and continue: 1100 / 221

Going ahead to step 4:
1100 divided by 221 is 4 with a remainder of 216.
The next digit of our result is 4. 
Result so far: 24.0
If we take 884 away from 1100, we end up with 216.
Append the next digit (5) from the dividend to 216 and continue with: 2165 / 221

Going ahead to step 5:
When dividing 2165 by 221, we get 9 with a remainder of 176.
Put 9 as the next digit of the answer. 
Result so far: 249.0
Subtract 1989 from 2165 to get 176.
Append the next digit (0) from the dividend to 176 and continue with: 1760 / 221

Step 6:
1760 divided by 221 is 7 with a remainder of 213.
Use 7 as the next digit of our solution. 
Result so far: 2497.0
If we take 1547 away from 1760, we end up with 213.
Include the next digit (1) from the dividend after 213, then repeat: 2131 / 221

Advancing to step 7:
221 can be fit into 2131 9 times, resulting in a remainder of 142.
Put 9 as the next digit of the answer. 
Result so far: 24979.0
Subtract 1989 from 2131 to get 142.
Take the next digit (2) from the dividend and append it to 142, then repeat: 1422 / 221

Step 8:
If we divide 1422 by 221, we get 6 and a remainder of 96.
Write down 6 as next digit of the result. 
Result so far: 249796.0
The remainder is 96 after subtracting 1326 from 1422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Advancing to step 9:
221 can be fit into 960 4 times, resulting in a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 249796.4
The remainder is 76 after subtracting 884 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 10:
221 goes into 760 3 times with a remainder of 97.
Write down 3 as next digit of the result. 
Result so far: 249796.43
Subtract 663 from 760 to get 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Let's proceed to step 11:
When dividing 970 by 221, we get 4 with a remainder of 86.
The number 4 becomes the next digit in our result. 
Result so far: 249796.434
Deduct 884 from 970 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 12:
860 divided by 221 is 3 with a remainder of 197.
The next digit of our result is 3. 
Result so far: 249796.4343
Subtract 663 from 860 to get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Moving on to step 13:
When dividing 1970 by 221, we get 8 with a remainder of 202.
The next digit of our result is 8. 
Result so far: 249796.43438
The remainder is 202 after subtracting 1768 from 1970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Moving on to step 14:
221 goes into 2020 9 times with a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 249796.434389
Subtract 1989 from 2020 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 15:
221 can be fit into 310 1 times, resulting in a remainder of 89.
Use 1 as the next digit of our solution. 
Result so far: 249796.4343891
Subtract 221 from 310 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Advancing to step 16:
If we divide 890 by 221, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 249796.43438914
Subtracting 884 from 890 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 249796.43438914, with a leftover of 6e-09.