We look at the division of 53656615 by 816 
The aim is to understand the frequency of 816 in 53656615.

Moving on to step 1:
5 divided by 816 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 816

Going ahead to step 2:
53 divided by 816 is 0 with a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 53 to get 53.
Grab the next digit (6) from the dividend, add it to 53, then carry on: 536 / 816

Moving on to step 3:
816 can be fit into 536 0 times, resulting in a remainder of 536.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 536 after subtracting 0 from 536.
Take the next digit (5) from the dividend and append it to 536, then repeat: 5365 / 816

Moving on to step 4:
The number 816 fits into 5365 6 times, leaving a remainder of 469.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 4896 from 5365 and we're left with 469.
Grab the next digit (6) from the dividend, add it to 469, then carry on: 4696 / 816

Step 5:
4696 divided by 816 is 5 with a remainder of 616.
The next digit of our result is 5. 
Result so far: 65.0
Subtracting 4080 from 4696 leaves us with 616.
Take the next digit (6) from the dividend and append it to 616, then repeat: 6166 / 816

On to step 6:
If we divide 6166 by 816, we get 7 and a remainder of 454.
Use 7 as the next digit of our solution. 
Result so far: 657.0
If we take 5712 away from 6166, we end up with 454.
Fetch the next digit (1) from the dividend, attach it to 454 and continue: 4541 / 816

Step 7:
816 can be fit into 4541 5 times, resulting in a remainder of 461.
Record the quotient 5 as the next digit in the result. 
Result so far: 6575.0
Subtract 4080 from 4541 to get 461.
Fetch the next digit (5) from the dividend, attach it to 461 and continue: 4615 / 816

Moving on to step 8:
816 can be fit into 4615 5 times, resulting in a remainder of 535.
Put 5 as the next digit of the answer. 
Result so far: 65755.0
Subtracting 4080 from 4615 leaves us with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Advancing to step 9:
816 goes into 5350 6 times with a remainder of 454.
The number 6 becomes the next digit in our result. 
Result so far: 65755.6
If we subtract 4896 from 5350, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Advancing to step 10:
When dividing 4540 by 816, we get 5 with a remainder of 460.
The number 5 becomes the next digit in our result. 
Result so far: 65755.65
Subtracting 4080 from 4540 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Advancing to step 11:
4600 divided by 816 is 5 with a remainder of 520.
Record the quotient 5 as the next digit in the result. 
Result so far: 65755.655
Subtract 4080 from 4600 to get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Our division results in 65755.655 with a remaining 0.052.