We look at the division of 154510 by 80 
The aim is to understand the frequency of 80 in 154510.

On to step 1:
When dividing 1 by 80, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 80

Going ahead to step 2:
The number 80 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Bring next digit (4) of the dividend behind the 15 and repeat the process: 154 / 80

Advancing to step 3:
The number 80 fits into 154 1 times, leaving a remainder of 74.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 74 after subtracting 80 from 154.
Take the next digit (5) from the dividend and append it to 74, then repeat: 745 / 80

Going ahead to step 4:
If we divide 745 by 80, we get 9 and a remainder of 25.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we subtract 720 from 745, we get 25.
Fetch the next digit (1) from the dividend, attach it to 25 and continue: 251 / 80

Advancing to step 5:
When dividing 251 by 80, we get 3 with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 193.0
Deduct 240 from 251 and we're left with 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 80

Moving on to step 6:
If we divide 110 by 80, we get 1 and a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 1931.0
If we subtract 80 from 110, we 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.

On to step 7:
When dividing 300 by 80, we get 3 with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 1931.3
Subtract 240 from 300 to get 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:
80 can be fit into 600 7 times, resulting in a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 1931.37
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 9:
80 goes into 400 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 1931.375
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.

Step 10:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1931.375
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:
80 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1931.375
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.

After the division, we end up with 1931.375 and a remainder of 0.0.