87591720 ÷ 220 
The aim is to understand the frequency of 220 in 87591720.

Step 1:
The number 220 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
Subtracting 0 from 8 leaves us with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 220

Step 2:
87 divided by 220 is 0 with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 87 and we're left with 87.
Include the next digit (5) from the dividend after 87, then repeat: 875 / 220

On to step 3:
875 divided by 220 is 3 with a remainder of 215.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 660 from 875 to get 215.
Bring next digit (9) of the dividend behind the 215 and repeat the process: 2159 / 220

Going ahead to step 4:
The number 220 fits into 2159 9 times, leaving a remainder of 179.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Deduct 1980 from 2159 and we're left with 179.
Include the next digit (1) from the dividend after 179, then repeat: 1791 / 220

On to step 5:
1791 divided by 220 is 8 with a remainder of 31.
Use 8 as the next digit of our solution. 
Result so far: 398.0
If we subtract 1760 from 1791, we get 31.
Include the next digit (7) from the dividend after 31, then repeat: 317 / 220

Moving on to step 6:
220 can be fit into 317 1 times, resulting in a remainder of 97.
Use 1 as the next digit of our solution. 
Result so far: 3981.0
Subtract 220 from 317 to get 97.
Bring next digit (2) of the dividend behind the 97 and repeat the process: 972 / 220

Going ahead to step 7:
If we divide 972 by 220, we get 4 and a remainder of 92.
The number 4 becomes the next digit in our result. 
Result so far: 39814.0
Subtracting 880 from 972 leaves us with 92.
Append the next digit (0) from the dividend to 92 and continue with: 920 / 220

Moving on to step 8:
220 goes into 920 4 times with a remainder of 40.
The next digit of our result is 4. 
Result so far: 398144.0
If we subtract 880 from 920, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
When dividing 400 by 220, we get 1 with a remainder of 180.
Put 1 as the next digit of the answer. 
Result so far: 398144.1
Subtract 220 from 400 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 10:
If we divide 1800 by 220, we get 8 and a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 398144.18
If we take 1760 away from 1800, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
The number 220 fits into 400 1 times, leaving a remainder of 180.
The number 1 becomes the next digit in our result. 
Result so far: 398144.181
The remainder is 180 after subtracting 220 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 12:
The number 220 fits into 1800 8 times, leaving a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 398144.1818
Subtracting 1760 from 1800 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 13:
When dividing 400 by 220, we get 1 with a remainder of 180.
The number 1 becomes the next digit in our result. 
Result so far: 398144.18181
If we subtract 220 from 400, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 14:
If we divide 1800 by 220, we get 8 and a remainder of 40.
The next digit of our result is 8. 
Result so far: 398144.181818
Subtracting 1760 from 1800 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 15:
400 divided by 220 is 1 with a remainder of 180.
Record the quotient 1 as the next digit in the result. 
Result so far: 398144.1818181
Subtracting 220 from 400 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 16:
When dividing 1800 by 220, we get 8 with a remainder of 40.
The next digit of our result is 8. 
Result so far: 398144.18181818
Deduct 1760 from 1800 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 398144.18181818 and a remainder of 4e-08.