We're dividing 131511 by 80 
We want to figure out the number of times 131511 can be divided by 80.

Step 1:
1 divided by 80 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 80

Moving on to step 2:
If we divide 13 by 80, we get 0 and a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 80

Let's proceed to step 3:
If we divide 131 by 80, we get 1 and a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 80 from 131 and we're left with 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 80

Going ahead to step 4:
The number 80 fits into 515 6 times, leaving a remainder of 35.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we take 480 away from 515, we end up with 35.
Grab the next digit (1) from the dividend, add it to 35, then carry on: 351 / 80

Let's proceed to step 5:
351 divided by 80 is 4 with a remainder of 31.
Write down 4 as next digit of the result. 
Result so far: 164.0
Deduct 320 from 351 and we're left with 31.
Include the next digit (1) from the dividend after 31, then repeat: 311 / 80

Moving on to step 6:
80 goes into 311 3 times with a remainder of 71.
The next digit of our result is 3. 
Result so far: 1643.0
The remainder is 71 after subtracting 240 from 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 7:
80 can be fit into 710 8 times, resulting in a remainder of 70.
Record the quotient 8 as the next digit in the result. 
Result so far: 1643.8
If we subtract 640 from 710, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 8:
When dividing 700 by 80, we get 8 with a remainder of 60.
Put 8 as the next digit of the answer. 
Result so far: 1643.88
If we take 640 away from 700, 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.

The final result is 1643.88 with a remainder of 0.06.