86399783 divided by 688 
We're looking to find how many times 688 goes into 86399783.

Step 1:
If we divide 8 by 688, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 688

Moving on to step 2:
If we divide 86 by 688, we get 0 and a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 688

Let's proceed to step 3:
If we divide 863 by 688, we get 1 and a remainder of 175.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 688 from 863 leaves us with 175.
Fetch the next digit (9) from the dividend, attach it to 175 and continue: 1759 / 688

Moving on to step 4:
When dividing 1759 by 688, we get 2 with a remainder of 383.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 1376 from 1759, we get 383.
Include the next digit (9) from the dividend after 383, then repeat: 3839 / 688

Let's proceed to step 5:
When dividing 3839 by 688, we get 5 with a remainder of 399.
Write down 5 as next digit of the result. 
Result so far: 125.0
If we take 3440 away from 3839, we end up with 399.
Bring next digit (7) of the dividend behind the 399 and repeat the process: 3997 / 688

Advancing to step 6:
688 can be fit into 3997 5 times, resulting in a remainder of 557.
Write down 5 as next digit of the result. 
Result so far: 1255.0
Subtracting 3440 from 3997 leaves us with 557.
Append the next digit (8) from the dividend to 557 and continue with: 5578 / 688

Moving on to step 7:
688 can be fit into 5578 8 times, resulting in a remainder of 74.
Put 8 as the next digit of the answer. 
Result so far: 12558.0
Deduct 5504 from 5578 and we're left with 74.
Take the next digit (3) from the dividend and append it to 74, then repeat: 743 / 688

Let's proceed to step 8:
688 can be fit into 743 1 times, resulting in a remainder of 55.
Use 1 as the next digit of our solution. 
Result so far: 125581.0
Deduct 688 from 743 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 9:
688 goes into 550 0 times with a remainder of 550.
The next digit of our result is 0. 
Result so far: 125581.0
If we take 0 away from 550, we end up with 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Let's proceed to step 10:
If we divide 5500 by 688, we get 7 and a remainder of 684.
Use 7 as the next digit of our solution. 
Result so far: 125581.07
If we subtract 4816 from 5500, we get 684.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6840, and continue the process.

Advancing to step 11:
6840 divided by 688 is 9 with a remainder of 648.
Record the quotient 9 as the next digit in the result. 
Result so far: 125581.079
If we take 6192 away from 6840, we end up with 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

Step 12:
The number 688 fits into 6480 9 times, leaving a remainder of 288.
The next digit of our result is 9. 
Result so far: 125581.0799
If we take 6192 away from 6480, we end up with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

The final outcome is 125581.0799, with a leftover of 0.00288.