We're dividing 54125195 by 648 
The aim is to understand the frequency of 648 in 54125195.

Step 1:
The number 648 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 648

Step 2:
54 divided by 648 is 0 with a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Take the next digit (1) from the dividend and append it to 54, then repeat: 541 / 648

Going ahead to step 3:
648 can be fit into 541 0 times, resulting in a remainder of 541.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 541 after subtracting 0 from 541.
Fetch the next digit (2) from the dividend, attach it to 541 and continue: 5412 / 648

Step 4:
5412 divided by 648 is 8 with a remainder of 228.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 228 after subtracting 5184 from 5412.
Bring next digit (5) of the dividend behind the 228 and repeat the process: 2285 / 648

Step 5:
648 can be fit into 2285 3 times, resulting in a remainder of 341.
Put 3 as the next digit of the answer. 
Result so far: 83.0
If we take 1944 away from 2285, we end up with 341.
Take the next digit (1) from the dividend and append it to 341, then repeat: 3411 / 648

Let's proceed to step 6:
648 goes into 3411 5 times with a remainder of 171.
Record the quotient 5 as the next digit in the result. 
Result so far: 835.0
Deduct 3240 from 3411 and we're left with 171.
Append the next digit (9) from the dividend to 171 and continue with: 1719 / 648

Going ahead to step 7:
The number 648 fits into 1719 2 times, leaving a remainder of 423.
The number 2 becomes the next digit in our result. 
Result so far: 8352.0
If we take 1296 away from 1719, we end up with 423.
Take the next digit (5) from the dividend and append it to 423, then repeat: 4235 / 648

Moving on to step 8:
648 goes into 4235 6 times with a remainder of 347.
The next digit of our result is 6. 
Result so far: 83526.0
If we take 3888 away from 4235, we end up with 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

Moving on to step 9:
The number 648 fits into 3470 5 times, leaving a remainder of 230.
The next digit of our result is 5. 
Result so far: 83526.5
Subtracting 3240 from 3470 leaves us with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Step 10:
When dividing 2300 by 648, we get 3 with a remainder of 356.
The number 3 becomes the next digit in our result. 
Result so far: 83526.53
If we subtract 1944 from 2300, we get 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

On to step 11:
When dividing 3560 by 648, we get 5 with a remainder of 320.
Record the quotient 5 as the next digit in the result. 
Result so far: 83526.535
If we subtract 3240 from 3560, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 12:
When dividing 3200 by 648, we get 4 with a remainder of 608.
Use 4 as the next digit of our solution. 
Result so far: 83526.5354
Deduct 2592 from 3200 and we're left with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Advancing to step 13:
When dividing 6080 by 648, we get 9 with a remainder of 248.
Write down 9 as next digit of the result. 
Result so far: 83526.53549
If we take 5832 away from 6080, we end up with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Going ahead to step 14:
When dividing 2480 by 648, we get 3 with a remainder of 536.
The number 3 becomes the next digit in our result. 
Result so far: 83526.535493
If we subtract 1944 from 2480, we get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Moving on to step 15:
The number 648 fits into 5360 8 times, leaving a remainder of 176.
Write down 8 as next digit of the result. 
Result so far: 83526.5354938
If we subtract 5184 from 5360, we get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

On to step 16:
When dividing 1760 by 648, we get 2 with a remainder of 464.
Write down 2 as next digit of the result. 
Result so far: 83526.53549382
The remainder is 464 after subtracting 1296 from 1760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

After the division, we end up with 83526.53549382 and a remainder of 4.64e-07.