Let's divide 217129 by 80
The aim is to understand the frequency of 80 in 217129.

On to step 1:
80 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 80

On to step 2:
When dividing 21 by 80, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (7) from the dividend to 21 and continue with: 217 / 80

Step 3:
When dividing 217 by 80, we get 2 with a remainder of 57.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 57 after subtracting 160 from 217.
Include the next digit (1) from the dividend after 57, then repeat: 571 / 80

Going ahead to step 4:
The number 80 fits into 571 7 times, leaving a remainder of 11.
The next digit of our result is 7. 
Result so far: 27.0
Deduct 560 from 571 and we're left with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 80

Advancing to step 5:
80 can be fit into 112 1 times, resulting in a remainder of 32.
Write down 1 as next digit of the result. 
Result so far: 271.0
Deduct 80 from 112 and we're left with 32.
Grab the next digit (9) from the dividend, add it to 32, then carry on: 329 / 80

Going ahead to step 6:
When dividing 329 by 80, we get 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 2714.0
Subtract 320 from 329 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
80 goes into 90 1 times with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 2714.1
If we take 80 away from 90, we end up with 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 8:
The number 80 fits into 100 1 times, leaving a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 2714.11
Subtract 80 from 100 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 2714.11 and a remainder of 0.02.