Let's divide 86707609 by 80
We want to figure out the number of times 86707609 can be divided by 80.

Let's proceed to step 1:
80 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 80

Advancing to step 2:
80 can be fit into 86 1 times, resulting in a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 6 after subtracting 80 from 86.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 80

Going ahead to step 3:
When dividing 67 by 80, we get 0 with a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we take 0 away from 67, we end up with 67.
Append the next digit (0) from the dividend to 67 and continue with: 670 / 80

Let's proceed to step 4:
80 can be fit into 670 8 times, resulting in a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 108.0
If we take 640 away from 670, we end up with 30.
Fetch the next digit (7) from the dividend, attach it to 30 and continue: 307 / 80

Moving on to step 5:
307 divided by 80 is 3 with a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 1083.0
Deduct 240 from 307 and we're left with 67.
Include the next digit (6) from the dividend after 67, then repeat: 676 / 80

On to step 6:
The number 80 fits into 676 8 times, leaving a remainder of 36.
The next digit of our result is 8. 
Result so far: 10838.0
If we take 640 away from 676, we end up with 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 80

Advancing to step 7:
If we divide 360 by 80, we get 4 and a remainder of 40.
The next digit of our result is 4. 
Result so far: 108384.0
Subtract 320 from 360 to get 40.
Append the next digit (9) from the dividend to 40 and continue with: 409 / 80

On to step 8:
The number 80 fits into 409 5 times, leaving a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 1083845.0
If we subtract 400 from 409, we 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.

Advancing to step 9:
When dividing 90 by 80, we get 1 with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 1083845.1
Deduct 80 from 90 and we're left 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.

Let's proceed to step 10:
When dividing 100 by 80, we get 1 with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1083845.11
The remainder is 20 after subtracting 80 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 1083845.11 with a remaining 0.02.