85020423 divided by 648 
The aim is to understand the frequency of 648 in 85020423.

On to step 1:
648 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 648

Step 2:
The number 648 fits into 85 0 times, leaving a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 85 leaves us with 85.
Grab the next digit (0) from the dividend, add it to 85, then carry on: 850 / 648

Let's proceed to step 3:
The number 648 fits into 850 1 times, leaving a remainder of 202.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 648 from 850 to get 202.
Fetch the next digit (2) from the dividend, attach it to 202 and continue: 2022 / 648

Let's proceed to step 4:
648 goes into 2022 3 times with a remainder of 78.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
The remainder is 78 after subtracting 1944 from 2022.
Append the next digit (0) from the dividend to 78 and continue with: 780 / 648

Let's proceed to step 5:
The number 648 fits into 780 1 times, leaving a remainder of 132.
Use 1 as the next digit of our solution. 
Result so far: 131.0
If we subtract 648 from 780, we get 132.
Include the next digit (4) from the dividend after 132, then repeat: 1324 / 648

Going ahead to step 6:
If we divide 1324 by 648, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 1312.0
Subtract 1296 from 1324 to get 28.
Fetch the next digit (2) from the dividend, attach it to 28 and continue: 282 / 648

Step 7:
648 can be fit into 282 0 times, resulting in a remainder of 282.
Use 0 as the next digit of our solution. 
Result so far: 13120.0
Subtract 0 from 282 to get 282.
Fetch the next digit (3) from the dividend, attach it to 282 and continue: 2823 / 648

On to step 8:
When dividing 2823 by 648, we get 4 with a remainder of 231.
Record the quotient 4 as the next digit in the result. 
Result so far: 131204.0
Deduct 2592 from 2823 and we're left with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Let's proceed to step 9:
2310 divided by 648 is 3 with a remainder of 366.
Use 3 as the next digit of our solution. 
Result so far: 131204.3
If we take 1944 away from 2310, we end up with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Moving on to step 10:
648 can be fit into 3660 5 times, resulting in a remainder of 420.
Put 5 as the next digit of the answer. 
Result so far: 131204.35
Subtracting 3240 from 3660 leaves us with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Moving on to step 11:
If we divide 4200 by 648, we get 6 and a remainder of 312.
Use 6 as the next digit of our solution. 
Result so far: 131204.356
Subtracting 3888 from 4200 leaves us with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Going ahead to step 12:
When dividing 3120 by 648, we get 4 with a remainder of 528.
The number 4 becomes the next digit in our result. 
Result so far: 131204.3564
The remainder is 528 after subtracting 2592 from 3120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Moving on to step 13:
5280 divided by 648 is 8 with a remainder of 96.
The next digit of our result is 8. 
Result so far: 131204.35648
If we take 5184 away from 5280, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 14:
If we divide 960 by 648, we get 1 and a remainder of 312.
The next digit of our result is 1. 
Result so far: 131204.356481
The remainder is 312 after subtracting 648 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Step 15:
648 goes into 3120 4 times with a remainder of 528.
The next digit of our result is 4. 
Result so far: 131204.3564814
If we take 2592 away from 3120, we end up with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Step 16:
648 goes into 5280 8 times with a remainder of 96.
Record the quotient 8 as the next digit in the result. 
Result so far: 131204.35648148
The remainder is 96 after subtracting 5184 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The quotient of the division is 131204.35648148, and the remainder is 9.6e-08.