We're dividing 413690 by 80 
The aim is to understand the frequency of 80 in 413690.

On to step 1:
80 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 80

Let's proceed to step 2:
If we divide 41 by 80, we get 0 and a remainder of 41.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 41 after subtracting 0 from 41.
Bring next digit (3) of the dividend behind the 41 and repeat the process: 413 / 80

Moving on to step 3:
The number 80 fits into 413 5 times, leaving a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 400 from 413 leaves us with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 80

Let's proceed to step 4:
When dividing 136 by 80, we get 1 with a remainder of 56.
Record the quotient 1 as the next digit in the result. 
Result so far: 51.0
Subtract 80 from 136 to get 56.
Append the next digit (9) from the dividend to 56 and continue with: 569 / 80

Step 5:
The number 80 fits into 569 7 times, leaving a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 517.0
Subtract 560 from 569 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 80

Advancing to step 6:
80 can be fit into 90 1 times, resulting in a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 5171.0
If we subtract 80 from 90, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
80 can be fit into 100 1 times, resulting in a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 5171.1
The remainder is 20 after subtracting 80 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
80 can be fit into 200 2 times, resulting in a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 5171.12
Deduct 160 from 200 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 9:
80 goes into 400 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 5171.125
Deduct 400 from 400 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
When dividing 0 by 80, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 5171.125
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5171.125
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 5171.125 with a remainder of 0.0.