54263648 divided by 813 
The aim is to understand the frequency of 813 in 54263648.

Moving on to step 1:
5 divided by 813 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 813

Let's proceed to step 2:
813 goes into 54 0 times with a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Grab the next digit (2) from the dividend, add it to 54, then carry on: 542 / 813

Let's proceed to step 3:
813 can be fit into 542 0 times, resulting in a remainder of 542.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 542 after subtracting 0 from 542.
Append the next digit (6) from the dividend to 542 and continue with: 5426 / 813

On to step 4:
If we divide 5426 by 813, we get 6 and a remainder of 548.
The next digit of our result is 6. 
Result so far: 6.0
If we take 4878 away from 5426, we end up with 548.
Grab the next digit (3) from the dividend, add it to 548, then carry on: 5483 / 813

Let's proceed to step 5:
813 can be fit into 5483 6 times, resulting in a remainder of 605.
The number 6 becomes the next digit in our result. 
Result so far: 66.0
Deduct 4878 from 5483 and we're left with 605.
Append the next digit (6) from the dividend to 605 and continue with: 6056 / 813

Going ahead to step 6:
When dividing 6056 by 813, we get 7 with a remainder of 365.
Use 7 as the next digit of our solution. 
Result so far: 667.0
Subtract 5691 from 6056 to get 365.
Bring next digit (4) of the dividend behind the 365 and repeat the process: 3654 / 813

Let's proceed to step 7:
If we divide 3654 by 813, we get 4 and a remainder of 402.
Record the quotient 4 as the next digit in the result. 
Result so far: 6674.0
If we subtract 3252 from 3654, we get 402.
Bring next digit (8) of the dividend behind the 402 and repeat the process: 4028 / 813

On to step 8:
4028 divided by 813 is 4 with a remainder of 776.
Put 4 as the next digit of the answer. 
Result so far: 66744.0
Subtracting 3252 from 4028 leaves us with 776.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7760, and continue the process.

On to step 9:
When dividing 7760 by 813, we get 9 with a remainder of 443.
Write down 9 as next digit of the result. 
Result so far: 66744.9
If we take 7317 away from 7760, we end up with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Going ahead to step 10:
When dividing 4430 by 813, we get 5 with a remainder of 365.
Use 5 as the next digit of our solution. 
Result so far: 66744.95
The remainder is 365 after subtracting 4065 from 4430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Let's proceed to step 11:
The number 813 fits into 3650 4 times, leaving a remainder of 398.
Write down 4 as next digit of the result. 
Result so far: 66744.954
Deduct 3252 from 3650 and we're left with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Moving on to step 12:
When dividing 3980 by 813, we get 4 with a remainder of 728.
Use 4 as the next digit of our solution. 
Result so far: 66744.9544
Subtract 3252 from 3980 to get 728.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7280, and continue the process.

The final outcome is 66744.9544, with a leftover of 0.00728.