138358 divided by 80 
The aim is to understand the frequency of 80 in 138358.

Moving on to step 1:
1 divided by 80 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 80

On to step 2:
The number 80 fits into 13 0 times, leaving a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 80

Advancing to step 3:
80 can be fit into 138 1 times, resulting in a remainder of 58.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 80 away from 138, we end up with 58.
Bring next digit (3) of the dividend behind the 58 and repeat the process: 583 / 80

On to step 4:
If we divide 583 by 80, we get 7 and a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Subtract 560 from 583 to get 23.
Include the next digit (5) from the dividend after 23, then repeat: 235 / 80

Step 5:
When dividing 235 by 80, we get 2 with a remainder of 75.
Use 2 as the next digit of our solution. 
Result so far: 172.0
The remainder is 75 after subtracting 160 from 235.
Fetch the next digit (8) from the dividend, attach it to 75 and continue: 758 / 80

Let's proceed to step 6:
When dividing 758 by 80, we get 9 with a remainder of 38.
Record the quotient 9 as the next digit in the result. 
Result so far: 1729.0
If we subtract 720 from 758, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 7:
The number 80 fits into 380 4 times, leaving a remainder of 60.
Use 4 as the next digit of our solution. 
Result so far: 1729.4
If we take 320 away from 380, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
When dividing 600 by 80, we get 7 with a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 1729.47
Subtracting 560 from 600 leaves us 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.

Let's proceed to step 9:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 1729.475
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.

Let's proceed to step 10:
0 divided by 80 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1729.475
If we take 0 away from 0, we end up 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.

Step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1729.475
Subtract 0 from 0 to 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.

After the division, we end up with 1729.475 and a remainder of 0.0.