We look at the division of 25702052 by 648 
The aim is to understand the frequency of 648 in 25702052.

Advancing to step 1:
2 divided by 648 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 648

Step 2:
The number 648 fits into 25 0 times, leaving a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Take the next digit (7) from the dividend and append it to 25, then repeat: 257 / 648

On to step 3:
When dividing 257 by 648, we get 0 with a remainder of 257.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 257, we end up with 257.
Fetch the next digit (0) from the dividend, attach it to 257 and continue: 2570 / 648

Let's proceed to step 4:
If we divide 2570 by 648, we get 3 and a remainder of 626.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1944 from 2570 leaves us with 626.
Include the next digit (2) from the dividend after 626, then repeat: 6262 / 648

Let's proceed to step 5:
648 can be fit into 6262 9 times, resulting in a remainder of 430.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 5832 away from 6262, we end up with 430.
Append the next digit (0) from the dividend to 430 and continue with: 4300 / 648

Step 6:
When dividing 4300 by 648, we get 6 with a remainder of 412.
Write down 6 as next digit of the result. 
Result so far: 396.0
The remainder is 412 after subtracting 3888 from 4300.
Grab the next digit (5) from the dividend, add it to 412, then carry on: 4125 / 648

Moving on to step 7:
648 can be fit into 4125 6 times, resulting in a remainder of 237.
Write down 6 as next digit of the result. 
Result so far: 3966.0
Deduct 3888 from 4125 and we're left with 237.
Take the next digit (2) from the dividend and append it to 237, then repeat: 2372 / 648

Step 8:
If we divide 2372 by 648, we get 3 and a remainder of 428.
The next digit of our result is 3. 
Result so far: 39663.0
If we take 1944 away from 2372, we end up with 428.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4280, and continue the process.

Let's proceed to step 9:
4280 divided by 648 is 6 with a remainder of 392.
Put 6 as the next digit of the answer. 
Result so far: 39663.6
Subtracting 3888 from 4280 leaves us with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Moving on to step 10:
648 goes into 3920 6 times with a remainder of 32.
Record the quotient 6 as the next digit in the result. 
Result so far: 39663.66
Deduct 3888 from 3920 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Our division results in 39663.66 with a remaining 0.032.