686399 ÷ 43 
Our goal is to divide 686399 by 43.

Let's proceed to step 1:
43 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 43

Advancing to step 2:
When dividing 68 by 43, we get 1 with a remainder of 25.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 43 from 68 leaves us with 25.
Include the next digit (6) from the dividend after 25, then repeat: 256 / 43

Going ahead to step 3:
If we divide 256 by 43, we get 5 and a remainder of 41.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 215 from 256 leaves us with 41.
Fetch the next digit (3) from the dividend, attach it to 41 and continue: 413 / 43

Advancing to step 4:
The number 43 fits into 413 9 times, leaving a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 159.0
Deduct 387 from 413 and we're left with 26.
Fetch the next digit (9) from the dividend, attach it to 26 and continue: 269 / 43

Step 5:
The number 43 fits into 269 6 times, leaving a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 1596.0
The remainder is 11 after subtracting 258 from 269.
Take the next digit (9) from the dividend and append it to 11, then repeat: 119 / 43

Advancing to step 6:
43 can be fit into 119 2 times, resulting in a remainder of 33.
Record the quotient 2 as the next digit in the result. 
Result so far: 15962.0
The remainder is 33 after subtracting 86 from 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
When dividing 330 by 43, we get 7 with a remainder of 29.
The number 7 becomes the next digit in our result. 
Result so far: 15962.7
Subtract 301 from 330 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 8:
If we divide 290 by 43, we get 6 and a remainder of 32.
Write down 6 as next digit of the result. 
Result so far: 15962.76
Subtract 258 from 290 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 9:
The number 43 fits into 320 7 times, leaving a remainder of 19.
Write down 7 as next digit of the result. 
Result so far: 15962.767
Deduct 301 from 320 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 10:
43 goes into 190 4 times with a remainder of 18.
The number 4 becomes the next digit in our result. 
Result so far: 15962.7674
If we subtract 172 from 190, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 11:
If we divide 180 by 43, we get 4 and a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 15962.76744
Subtracting 172 from 180 leaves us 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.

The quotient of the division is 15962.76744, and the remainder is 8e-06.