87966567 divided by 648 
The aim is to understand the frequency of 648 in 87966567.

Moving on to step 1:
When dividing 8 by 648, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 648

Step 2:
648 goes into 87 0 times with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Grab the next digit (9) from the dividend, add it to 87, then carry on: 879 / 648

Let's proceed to step 3:
If we divide 879 by 648, we get 1 and a remainder of 231.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 648 from 879 and we're left with 231.
Include the next digit (6) from the dividend after 231, then repeat: 2316 / 648

Step 4:
648 can be fit into 2316 3 times, resulting in a remainder of 372.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 1944 from 2316, we get 372.
Include the next digit (6) from the dividend after 372, then repeat: 3726 / 648

Step 5:
If we divide 3726 by 648, we get 5 and a remainder of 486.
Record the quotient 5 as the next digit in the result. 
Result so far: 135.0
Subtract 3240 from 3726 to get 486.
Fetch the next digit (5) from the dividend, attach it to 486 and continue: 4865 / 648

Moving on to step 6:
648 can be fit into 4865 7 times, resulting in a remainder of 329.
Put 7 as the next digit of the answer. 
Result so far: 1357.0
If we subtract 4536 from 4865, we get 329.
Take the next digit (6) from the dividend and append it to 329, then repeat: 3296 / 648

Let's proceed to step 7:
When dividing 3296 by 648, we get 5 with a remainder of 56.
Use 5 as the next digit of our solution. 
Result so far: 13575.0
Subtracting 3240 from 3296 leaves us with 56.
Fetch the next digit (7) from the dividend, attach it to 56 and continue: 567 / 648

On to step 8:
567 divided by 648 is 0 with a remainder of 567.
The next digit of our result is 0. 
Result so far: 135750.0
If we take 0 away from 567, we end up with 567.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5670, and continue the process.

On to step 9:
5670 divided by 648 is 8 with a remainder of 486.
Use 8 as the next digit of our solution. 
Result so far: 135750.8
If we take 5184 away from 5670, we end up with 486.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4860, and continue the process.

Moving on to step 10:
648 can be fit into 4860 7 times, resulting in a remainder of 324.
Write down 7 as next digit of the result. 
Result so far: 135750.87
The remainder is 324 after subtracting 4536 from 4860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Going ahead to step 11:
The number 648 fits into 3240 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 135750.875
The remainder is 0 after subtracting 3240 from 3240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
648 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 135750.875
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 13:
If we divide 0 by 648, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 135750.875
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 135750.875 with a remainder of 0.0.