We look at the division of 80872315 by 779 
Let's see how many times 779 fits into 80872315.

Step 1:
The number 779 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 779

On to step 2:
If we divide 80 by 779, we get 0 and a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Grab the next digit (8) from the dividend, add it to 80, then carry on: 808 / 779

Advancing to step 3:
If we divide 808 by 779, we get 1 and a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 779 from 808 and we're left with 29.
Grab the next digit (7) from the dividend, add it to 29, then carry on: 297 / 779

Going ahead to step 4:
When dividing 297 by 779, we get 0 with a remainder of 297.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 297 to get 297.
Include the next digit (2) from the dividend after 297, then repeat: 2972 / 779

Moving on to step 5:
When dividing 2972 by 779, we get 3 with a remainder of 635.
The next digit of our result is 3. 
Result so far: 103.0
Subtracting 2337 from 2972 leaves us with 635.
Grab the next digit (3) from the dividend, add it to 635, then carry on: 6353 / 779

On to step 6:
When dividing 6353 by 779, we get 8 with a remainder of 121.
The number 8 becomes the next digit in our result. 
Result so far: 1038.0
The remainder is 121 after subtracting 6232 from 6353.
Append the next digit (1) from the dividend to 121 and continue with: 1211 / 779

Step 7:
If we divide 1211 by 779, we get 1 and a remainder of 432.
The next digit of our result is 1. 
Result so far: 10381.0
Subtract 779 from 1211 to get 432.
Bring next digit (5) of the dividend behind the 432 and repeat the process: 4325 / 779

Step 8:
If we divide 4325 by 779, we get 5 and a remainder of 430.
Record the quotient 5 as the next digit in the result. 
Result so far: 103815.0
The remainder is 430 after subtracting 3895 from 4325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 9:
The number 779 fits into 4300 5 times, leaving a remainder of 405.
The next digit of our result is 5. 
Result so far: 103815.5
The remainder is 405 after subtracting 3895 from 4300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Step 10:
If we divide 4050 by 779, we get 5 and a remainder of 155.
Put 5 as the next digit of the answer. 
Result so far: 103815.55
Deduct 3895 from 4050 and we're left with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

After the division, we end up with 103815.55 and a remainder of 0.155.