We're dividing 10386786 by 816 
We want to figure out the number of times 10386786 can be divided by 816.

On to step 1:
816 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 816

Advancing to step 2:
10 divided by 816 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 816

On to step 3:
The number 816 fits into 103 0 times, leaving a remainder of 103.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 103 to get 103.
Grab the next digit (8) from the dividend, add it to 103, then carry on: 1038 / 816

Going ahead to step 4:
1038 divided by 816 is 1 with a remainder of 222.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 816 from 1038 to get 222.
Grab the next digit (6) from the dividend, add it to 222, then carry on: 2226 / 816

Advancing to step 5:
816 goes into 2226 2 times with a remainder of 594.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 594 after subtracting 1632 from 2226.
Take the next digit (7) from the dividend and append it to 594, then repeat: 5947 / 816

On to step 6:
816 goes into 5947 7 times with a remainder of 235.
The number 7 becomes the next digit in our result. 
Result so far: 127.0
Subtract 5712 from 5947 to get 235.
Fetch the next digit (8) from the dividend, attach it to 235 and continue: 2358 / 816

On to step 7:
816 can be fit into 2358 2 times, resulting in a remainder of 726.
Put 2 as the next digit of the answer. 
Result so far: 1272.0
If we subtract 1632 from 2358, we get 726.
Grab the next digit (6) from the dividend, add it to 726, then carry on: 7266 / 816

Step 8:
816 goes into 7266 8 times with a remainder of 738.
The next digit of our result is 8. 
Result so far: 12728.0
The remainder is 738 after subtracting 6528 from 7266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

Moving on to step 9:
7380 divided by 816 is 9 with a remainder of 36.
Record the quotient 9 as the next digit in the result. 
Result so far: 12728.9
Subtracting 7344 from 7380 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 10:
816 can be fit into 360 0 times, resulting in a remainder of 360.
The next digit of our result is 0. 
Result so far: 12728.9
Deduct 0 from 360 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 11:
3600 divided by 816 is 4 with a remainder of 336.
Put 4 as the next digit of the answer. 
Result so far: 12728.904
Subtract 3264 from 3600 to get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Advancing to step 12:
The number 816 fits into 3360 4 times, leaving a remainder of 96.
The number 4 becomes the next digit in our result. 
Result so far: 12728.9044
Subtracting 3264 from 3360 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The final result is 12728.9044 with a remainder of 0.00096.