51882637 ÷ 221 
The aim is to understand the frequency of 221 in 51882637.

On to step 1:
221 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 221

Going ahead to step 2:
221 can be fit into 51 0 times, resulting in a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Bring next digit (8) of the dividend behind the 51 and repeat the process: 518 / 221

Moving on to step 3:
518 divided by 221 is 2 with a remainder of 76.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 442 from 518 and we're left with 76.
Append the next digit (8) from the dividend to 76 and continue with: 768 / 221

Let's proceed to step 4:
If we divide 768 by 221, we get 3 and a remainder of 105.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
If we subtract 663 from 768, we get 105.
Append the next digit (2) from the dividend to 105 and continue with: 1052 / 221

Step 5:
The number 221 fits into 1052 4 times, leaving a remainder of 168.
Write down 4 as next digit of the result. 
Result so far: 234.0
Deduct 884 from 1052 and we're left with 168.
Grab the next digit (6) from the dividend, add it to 168, then carry on: 1686 / 221

Going ahead to step 6:
The number 221 fits into 1686 7 times, leaving a remainder of 139.
The next digit of our result is 7. 
Result so far: 2347.0
Deduct 1547 from 1686 and we're left with 139.
Include the next digit (3) from the dividend after 139, then repeat: 1393 / 221

Step 7:
221 goes into 1393 6 times with a remainder of 67.
Use 6 as the next digit of our solution. 
Result so far: 23476.0
If we take 1326 away from 1393, we end up with 67.
Include the next digit (7) from the dividend after 67, then repeat: 677 / 221

On to step 8:
If we divide 677 by 221, we get 3 and a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 234763.0
The remainder is 14 after subtracting 663 from 677.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 9:
When dividing 140 by 221, we get 0 with a remainder of 140.
Record the quotient 0 as the next digit in the result. 
Result so far: 234763.0
If we take 0 away from 140, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 10:
The number 221 fits into 1400 6 times, leaving a remainder of 74.
The next digit of our result is 6. 
Result so far: 234763.06
Subtract 1326 from 1400 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 11:
740 divided by 221 is 3 with a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 234763.063
Subtracting 663 from 740 leaves us with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 12:
221 can be fit into 770 3 times, resulting in a remainder of 107.
The next digit of our result is 3. 
Result so far: 234763.0633
Subtract 663 from 770 to get 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

After the division, we end up with 234763.0633 and a remainder of 0.00107.