Let's divide 64529640 by 648
The aim is to understand the frequency of 648 in 64529640.

On to step 1:
If we divide 6 by 648, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 648

On to step 2:
648 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Bring next digit (5) of the dividend behind the 64 and repeat the process: 645 / 648

Let's proceed to step 3:
The number 648 fits into 645 0 times, leaving a remainder of 645.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 645, we get 645.
Fetch the next digit (2) from the dividend, attach it to 645 and continue: 6452 / 648

Step 4:
6452 divided by 648 is 9 with a remainder of 620.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we take 5832 away from 6452, we end up with 620.
Append the next digit (9) from the dividend to 620 and continue with: 6209 / 648

Step 5:
648 goes into 6209 9 times with a remainder of 377.
The number 9 becomes the next digit in our result. 
Result so far: 99.0
If we subtract 5832 from 6209, we get 377.
Append the next digit (6) from the dividend to 377 and continue with: 3776 / 648

Step 6:
648 goes into 3776 5 times with a remainder of 536.
Put 5 as the next digit of the answer. 
Result so far: 995.0
The remainder is 536 after subtracting 3240 from 3776.
Fetch the next digit (4) from the dividend, attach it to 536 and continue: 5364 / 648

On to step 7:
When dividing 5364 by 648, we get 8 with a remainder of 180.
The number 8 becomes the next digit in our result. 
Result so far: 9958.0
Subtracting 5184 from 5364 leaves us with 180.
Grab the next digit (0) from the dividend, add it to 180, then carry on: 1800 / 648

Advancing to step 8:
1800 divided by 648 is 2 with a remainder of 504.
The number 2 becomes the next digit in our result. 
Result so far: 99582.0
The remainder is 504 after subtracting 1296 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Going ahead to step 9:
The number 648 fits into 5040 7 times, leaving a remainder of 504.
Put 7 as the next digit of the answer. 
Result so far: 99582.7
If we subtract 4536 from 5040, we get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Let's proceed to step 10:
5040 divided by 648 is 7 with a remainder of 504.
Record the quotient 7 as the next digit in the result. 
Result so far: 99582.77
Subtract 4536 from 5040 to get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

After the division, we end up with 99582.77 and a remainder of 0.504.