We look at the division of 80413971 by 817 
The aim is to understand the frequency of 817 in 80413971.

Step 1:
817 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 817

Advancing to step 2:
If we divide 80 by 817, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Grab the next digit (4) from the dividend, add it to 80, then carry on: 804 / 817

Going ahead to step 3:
When dividing 804 by 817, we get 0 with a remainder of 804.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 804 after subtracting 0 from 804.
Grab the next digit (1) from the dividend, add it to 804, then carry on: 8041 / 817

Step 4:
817 goes into 8041 9 times with a remainder of 688.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtract 7353 from 8041 to get 688.
Take the next digit (3) from the dividend and append it to 688, then repeat: 6883 / 817

Step 5:
6883 divided by 817 is 8 with a remainder of 347.
The number 8 becomes the next digit in our result. 
Result so far: 98.0
Deduct 6536 from 6883 and we're left with 347.
Fetch the next digit (9) from the dividend, attach it to 347 and continue: 3479 / 817

Step 6:
When dividing 3479 by 817, we get 4 with a remainder of 211.
Record the quotient 4 as the next digit in the result. 
Result so far: 984.0
Deduct 3268 from 3479 and we're left with 211.
Include the next digit (7) from the dividend after 211, then repeat: 2117 / 817

Going ahead to step 7:
817 can be fit into 2117 2 times, resulting in a remainder of 483.
Put 2 as the next digit of the answer. 
Result so far: 9842.0
If we take 1634 away from 2117, we end up with 483.
Grab the next digit (1) from the dividend, add it to 483, then carry on: 4831 / 817

On to step 8:
If we divide 4831 by 817, we get 5 and a remainder of 746.
Record the quotient 5 as the next digit in the result. 
Result so far: 98425.0
If we subtract 4085 from 4831, we get 746.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7460, and continue the process.

Step 9:
817 goes into 7460 9 times with a remainder of 107.
Put 9 as the next digit of the answer. 
Result so far: 98425.9
Subtracting 7353 from 7460 leaves us with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Going ahead to step 10:
1070 divided by 817 is 1 with a remainder of 253.
Use 1 as the next digit of our solution. 
Result so far: 98425.91
Subtracting 817 from 1070 leaves us with 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Moving on to step 11:
2530 divided by 817 is 3 with a remainder of 79.
The number 3 becomes the next digit in our result. 
Result so far: 98425.913
Deduct 2451 from 2530 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 12:
817 goes into 790 0 times with a remainder of 790.
Write down 0 as next digit of the result. 
Result so far: 98425.913
The remainder is 790 after subtracting 0 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7900, and continue the process.

Moving on to step 13:
817 can be fit into 7900 9 times, resulting in a remainder of 547.
Use 9 as the next digit of our solution. 
Result so far: 98425.91309
The remainder is 547 after subtracting 7353 from 7900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

Let's proceed to step 14:
817 can be fit into 5470 6 times, resulting in a remainder of 568.
Put 6 as the next digit of the answer. 
Result so far: 98425.913096
The remainder is 568 after subtracting 4902 from 5470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Advancing to step 15:
817 goes into 5680 6 times with a remainder of 778.
The number 6 becomes the next digit in our result. 
Result so far: 98425.9130966
If we subtract 4902 from 5680, we get 778.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7780, and continue the process.

Our division results in 98425.9130966 with a remaining 7.78e-06.