We're dividing 80417171 by 810 
The aim is to understand the frequency of 810 in 80417171.

Moving on to step 1:
The number 810 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 810

Advancing to step 2:
810 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Grab the next digit (4) from the dividend, add it to 80, then carry on: 804 / 810

Going ahead to step 3:
The number 810 fits into 804 0 times, leaving a remainder of 804.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 804, we end up with 804.
Include the next digit (1) from the dividend after 804, then repeat: 8041 / 810

On to step 4:
8041 divided by 810 is 9 with a remainder of 751.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 7290 away from 8041, we end up with 751.
Grab the next digit (7) from the dividend, add it to 751, then carry on: 7517 / 810

Advancing to step 5:
The number 810 fits into 7517 9 times, leaving a remainder of 227.
Write down 9 as next digit of the result. 
Result so far: 99.0
Deduct 7290 from 7517 and we're left with 227.
Take the next digit (1) from the dividend and append it to 227, then repeat: 2271 / 810

On to step 6:
2271 divided by 810 is 2 with a remainder of 651.
Write down 2 as next digit of the result. 
Result so far: 992.0
The remainder is 651 after subtracting 1620 from 2271.
Bring next digit (7) of the dividend behind the 651 and repeat the process: 6517 / 810

Step 7:
6517 divided by 810 is 8 with a remainder of 37.
The number 8 becomes the next digit in our result. 
Result so far: 9928.0
The remainder is 37 after subtracting 6480 from 6517.
Append the next digit (1) from the dividend to 37 and continue with: 371 / 810

Advancing to step 8:
When dividing 371 by 810, we get 0 with a remainder of 371.
The number 0 becomes the next digit in our result. 
Result so far: 99280.0
If we take 0 away from 371, we end up with 371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Let's proceed to step 9:
If we divide 3710 by 810, we get 4 and a remainder of 470.
The next digit of our result is 4. 
Result so far: 99280.4
Subtracting 3240 from 3710 leaves us with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 10:
The number 810 fits into 4700 5 times, leaving a remainder of 650.
The next digit of our result is 5. 
Result so far: 99280.45
Deduct 4050 from 4700 and we're left with 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

On to step 11:
The number 810 fits into 6500 8 times, leaving a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 99280.458
The remainder is 20 after subtracting 6480 from 6500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
200 divided by 810 is 0 with a remainder of 200.
The next digit of our result is 0. 
Result so far: 99280.458
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 13:
810 can be fit into 2000 2 times, resulting in a remainder of 380.
Write down 2 as next digit of the result. 
Result so far: 99280.45802
Subtract 1620 from 2000 to get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 14:
When dividing 3800 by 810, we get 4 with a remainder of 560.
Put 4 as the next digit of the answer. 
Result so far: 99280.458024
Deduct 3240 from 3800 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Advancing to step 15:
The number 810 fits into 5600 6 times, leaving a remainder of 740.
The next digit of our result is 6. 
Result so far: 99280.4580246
Subtract 4860 from 5600 to get 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7400, and continue the process.

On to step 16:
When dividing 7400 by 810, we get 9 with a remainder of 110.
Put 9 as the next digit of the answer. 
Result so far: 99280.45802469
Subtract 7290 from 7400 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

After the division, we end up with 99280.45802469 and a remainder of 1.1e-07.