We're dividing 64124980 by 816 
The aim is to understand the frequency of 816 in 64124980.

Let's proceed to step 1:
When dividing 6 by 816, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 816

Going ahead to step 2:
816 can be fit into 64 0 times, resulting in a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Bring next digit (1) of the dividend behind the 64 and repeat the process: 641 / 816

Moving on to step 3:
816 goes into 641 0 times with a remainder of 641.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 641 to get 641.
Fetch the next digit (2) from the dividend, attach it to 641 and continue: 6412 / 816

Advancing to step 4:
6412 divided by 816 is 7 with a remainder of 700.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 5712 from 6412, we get 700.
Fetch the next digit (4) from the dividend, attach it to 700 and continue: 7004 / 816

Moving on to step 5:
7004 divided by 816 is 8 with a remainder of 476.
Use 8 as the next digit of our solution. 
Result so far: 78.0
If we subtract 6528 from 7004, we get 476.
Fetch the next digit (9) from the dividend, attach it to 476 and continue: 4769 / 816

Let's proceed to step 6:
4769 divided by 816 is 5 with a remainder of 689.
Use 5 as the next digit of our solution. 
Result so far: 785.0
If we take 4080 away from 4769, we end up with 689.
Take the next digit (8) from the dividend and append it to 689, then repeat: 6898 / 816

On to step 7:
816 can be fit into 6898 8 times, resulting in a remainder of 370.
Put 8 as the next digit of the answer. 
Result so far: 7858.0
If we subtract 6528 from 6898, we get 370.
Fetch the next digit (0) from the dividend, attach it to 370 and continue: 3700 / 816

Step 8:
3700 divided by 816 is 4 with a remainder of 436.
Put 4 as the next digit of the answer. 
Result so far: 78584.0
Subtract 3264 from 3700 to get 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Going ahead to step 9:
If we divide 4360 by 816, we get 5 and a remainder of 280.
Write down 5 as next digit of the result. 
Result so far: 78584.5
The remainder is 280 after subtracting 4080 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 10:
When dividing 2800 by 816, we get 3 with a remainder of 352.
Put 3 as the next digit of the answer. 
Result so far: 78584.53
Subtracting 2448 from 2800 leaves us with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 11:
When dividing 3520 by 816, we get 4 with a remainder of 256.
Record the quotient 4 as the next digit in the result. 
Result so far: 78584.534
If we take 3264 away from 3520, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 12:
When dividing 2560 by 816, we get 3 with a remainder of 112.
The next digit of our result is 3. 
Result so far: 78584.5343
If we take 2448 away from 2560, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 13:
The number 816 fits into 1120 1 times, leaving a remainder of 304.
Write down 1 as next digit of the result. 
Result so far: 78584.53431
Deduct 816 from 1120 and we're left with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Let's proceed to step 14:
When dividing 3040 by 816, we get 3 with a remainder of 592.
Write down 3 as next digit of the result. 
Result so far: 78584.534313
Subtracting 2448 from 3040 leaves us with 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Moving on to step 15:
816 can be fit into 5920 7 times, resulting in a remainder of 208.
Use 7 as the next digit of our solution. 
Result so far: 78584.5343137
If we subtract 5712 from 5920, we get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 16:
2080 divided by 816 is 2 with a remainder of 448.
Record the quotient 2 as the next digit in the result. 
Result so far: 78584.53431372
Subtracting 1632 from 2080 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Our division results in 78584.53431372 with a remaining 4.48e-07.