815999 ÷ 77 
We want to figure out the number of times 815999 can be divided by 77.

Step 1:
The number 77 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 77

Going ahead to step 2:
77 can be fit into 81 1 times, resulting in a remainder of 4.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 77 from 81, we get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 77

Going ahead to step 3:
The number 77 fits into 45 0 times, leaving a remainder of 45.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 45 to get 45.
Include the next digit (9) from the dividend after 45, then repeat: 459 / 77

Going ahead to step 4:
77 can be fit into 459 5 times, resulting in a remainder of 74.
The number 5 becomes the next digit in our result. 
Result so far: 105.0
Subtracting 385 from 459 leaves us with 74.
Append the next digit (9) from the dividend to 74 and continue with: 749 / 77

On to step 5:
The number 77 fits into 749 9 times, leaving a remainder of 56.
The number 9 becomes the next digit in our result. 
Result so far: 1059.0
If we subtract 693 from 749, we get 56.
Bring next digit (9) of the dividend behind the 56 and repeat the process: 569 / 77

Let's proceed to step 6:
77 goes into 569 7 times with a remainder of 30.
Record the quotient 7 as the next digit in the result. 
Result so far: 10597.0
If we subtract 539 from 569, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 7:
If we divide 300 by 77, we get 3 and a remainder of 69.
Record the quotient 3 as the next digit in the result. 
Result so far: 10597.3
Deduct 231 from 300 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 8:
77 can be fit into 690 8 times, resulting in a remainder of 74.
The number 8 becomes the next digit in our result. 
Result so far: 10597.38
Subtract 616 from 690 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 9:
When dividing 740 by 77, we get 9 with a remainder of 47.
The next digit of our result is 9. 
Result so far: 10597.389
If we take 693 away from 740, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 10:
470 divided by 77 is 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 10597.3896
Deduct 462 from 470 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
The number 77 fits into 80 1 times, leaving a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 10597.38961
Subtract 77 from 80 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 12:
77 goes into 30 0 times with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 10597.38961
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 13:
77 can be fit into 300 3 times, resulting in a remainder of 69.
Record the quotient 3 as the next digit in the result. 
Result so far: 10597.3896103
The remainder is 69 after subtracting 231 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 14:
77 can be fit into 690 8 times, resulting in a remainder of 74.
The number 8 becomes the next digit in our result. 
Result so far: 10597.38961038
Subtracting 616 from 690 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

The final outcome is 10597.38961038, with a leftover of 7.4e-08.