We're dividing 71351443 by 864 
The aim is to understand the frequency of 864 in 71351443.

Step 1:
When dividing 7 by 864, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 864

Advancing to step 2:
When dividing 71 by 864, we get 0 with a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 71, we get 71.
Bring next digit (3) of the dividend behind the 71 and repeat the process: 713 / 864

Step 3:
864 goes into 713 0 times with a remainder of 713.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 713, we get 713.
Grab the next digit (5) from the dividend, add it to 713, then carry on: 7135 / 864

Let's proceed to step 4:
When dividing 7135 by 864, we get 8 with a remainder of 223.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 6912 from 7135 and we're left with 223.
Grab the next digit (1) from the dividend, add it to 223, then carry on: 2231 / 864

Let's proceed to step 5:
2231 divided by 864 is 2 with a remainder of 503.
Record the quotient 2 as the next digit in the result. 
Result so far: 82.0
If we take 1728 away from 2231, we end up with 503.
Take the next digit (4) from the dividend and append it to 503, then repeat: 5034 / 864

Let's proceed to step 6:
864 can be fit into 5034 5 times, resulting in a remainder of 714.
The next digit of our result is 5. 
Result so far: 825.0
The remainder is 714 after subtracting 4320 from 5034.
Grab the next digit (4) from the dividend, add it to 714, then carry on: 7144 / 864

On to step 7:
The number 864 fits into 7144 8 times, leaving a remainder of 232.
Record the quotient 8 as the next digit in the result. 
Result so far: 8258.0
Subtract 6912 from 7144 to get 232.
Take the next digit (3) from the dividend and append it to 232, then repeat: 2323 / 864

Step 8:
If we divide 2323 by 864, we get 2 and a remainder of 595.
Write down 2 as next digit of the result. 
Result so far: 82582.0
If we take 1728 away from 2323, we end up with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Going ahead to step 9:
If we divide 5950 by 864, we get 6 and a remainder of 766.
Put 6 as the next digit of the answer. 
Result so far: 82582.6
Subtract 5184 from 5950 to get 766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7660, and continue the process.

Advancing to step 10:
864 can be fit into 7660 8 times, resulting in a remainder of 748.
Put 8 as the next digit of the answer. 
Result so far: 82582.68
If we subtract 6912 from 7660, we get 748.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7480, and continue the process.

Going ahead to step 11:
7480 divided by 864 is 8 with a remainder of 568.
Use 8 as the next digit of our solution. 
Result so far: 82582.688
Deduct 6912 from 7480 and we're left with 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

The final outcome is 82582.688, with a leftover of 0.0568.