80791155 ÷ 258 
The aim is to understand the frequency of 258 in 80791155.

On to step 1:
The number 258 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 258

Step 2:
80 divided by 258 is 0 with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Take the next digit (7) from the dividend and append it to 80, then repeat: 807 / 258

Step 3:
The number 258 fits into 807 3 times, leaving a remainder of 33.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 33 after subtracting 774 from 807.
Bring next digit (9) of the dividend behind the 33 and repeat the process: 339 / 258

Let's proceed to step 4:
339 divided by 258 is 1 with a remainder of 81.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
Subtracting 258 from 339 leaves us with 81.
Include the next digit (1) from the dividend after 81, then repeat: 811 / 258

Advancing to step 5:
258 can be fit into 811 3 times, resulting in a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 313.0
Deduct 774 from 811 and we're left with 37.
Append the next digit (1) from the dividend to 37 and continue with: 371 / 258

Step 6:
If we divide 371 by 258, we get 1 and a remainder of 113.
The next digit of our result is 1. 
Result so far: 3131.0
If we take 258 away from 371, we end up with 113.
Grab the next digit (5) from the dividend, add it to 113, then carry on: 1135 / 258

Advancing to step 7:
The number 258 fits into 1135 4 times, leaving a remainder of 103.
The next digit of our result is 4. 
Result so far: 31314.0
Subtracting 1032 from 1135 leaves us with 103.
Take the next digit (5) from the dividend and append it to 103, then repeat: 1035 / 258

Let's proceed to step 8:
When dividing 1035 by 258, we get 4 with a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 313144.0
The remainder is 3 after subtracting 1032 from 1035.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 9:
The number 258 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 313144.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 10:
If we divide 300 by 258, we get 1 and a remainder of 42.
The number 1 becomes the next digit in our result. 
Result so far: 313144.01
The remainder is 42 after subtracting 258 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 11:
If we divide 420 by 258, we get 1 and a remainder of 162.
Use 1 as the next digit of our solution. 
Result so far: 313144.011
If we take 258 away from 420, we end up with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

The final outcome is 313144.011, with a leftover of 0.0162.