85409094 ÷ 80 
We want to figure out the number of times 85409094 can be divided by 80.

Advancing to step 1:
80 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 80

Advancing to step 2:
80 goes into 85 1 times with a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 80 from 85 leaves us with 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 80

Let's proceed to step 3:
The number 80 fits into 54 0 times, leaving a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 54, we end up with 54.
Include the next digit (0) from the dividend after 54, then repeat: 540 / 80

Let's proceed to step 4:
When dividing 540 by 80, we get 6 with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 106.0
If we take 480 away from 540, we end up with 60.
Grab the next digit (9) from the dividend, add it to 60, then carry on: 609 / 80

Going ahead to step 5:
If we divide 609 by 80, we get 7 and a remainder of 49.
The number 7 becomes the next digit in our result. 
Result so far: 1067.0
The remainder is 49 after subtracting 560 from 609.
Grab the next digit (0) from the dividend, add it to 49, then carry on: 490 / 80

Step 6:
80 goes into 490 6 times with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 10676.0
Subtracting 480 from 490 leaves us with 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 80

Let's proceed to step 7:
The number 80 fits into 109 1 times, leaving a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 106761.0
Subtract 80 from 109 to get 29.
Take the next digit (4) from the dividend and append it to 29, then repeat: 294 / 80

Moving on to step 8:
When dividing 294 by 80, we get 3 with a remainder of 54.
The next digit of our result is 3. 
Result so far: 1067613.0
If we subtract 240 from 294, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 9:
The number 80 fits into 540 6 times, leaving a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 1067613.6
Subtract 480 from 540 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.

Moving on to step 10:
600 divided by 80 is 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 1067613.67
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 11:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 1067613.675
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1067613.675
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.

Advancing to step 13:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1067613.675
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.

The final outcome is 1067613.675, with a leftover of 0.0.