We look at the division of 439664 by 86 
Let's see how many times 86 fits into 439664.

On to step 1:
86 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 86

On to step 2:
43 divided by 86 is 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 43 and we're left with 43.
Bring next digit (9) of the dividend behind the 43 and repeat the process: 439 / 86

Let's proceed to step 3:
If we divide 439 by 86, we get 5 and a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 430 from 439, we get 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 86

On to step 4:
The number 86 fits into 96 1 times, leaving a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 51.0
If we take 86 away from 96, we end up with 10.
Append the next digit (6) from the dividend to 10 and continue with: 106 / 86

Advancing to step 5:
When dividing 106 by 86, we get 1 with a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 511.0
Deduct 86 from 106 and we're left with 20.
Take the next digit (4) from the dividend and append it to 20, then repeat: 204 / 86

Moving on to step 6:
If we divide 204 by 86, we get 2 and a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 5112.0
Subtract 172 from 204 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.

Let's proceed to step 7:
320 divided by 86 is 3 with a remainder of 62.
Write down 3 as next digit of the result. 
Result so far: 5112.3
If we subtract 258 from 320, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 8:
620 divided by 86 is 7 with a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 5112.37
The remainder is 18 after subtracting 602 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
When dividing 180 by 86, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 5112.372
If we take 172 away from 180, we end up 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.

Let's proceed to step 10:
If we divide 80 by 86, we get 0 and a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 5112.372
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 11:
When dividing 800 by 86, we get 9 with a remainder of 26.
The next digit of our result is 9. 
Result so far: 5112.37209
If we subtract 774 from 800, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 12:
If we divide 260 by 86, we get 3 and a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 5112.372093
If we subtract 258 from 260, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
When dividing 20 by 86, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 5112.372093
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 14:
The number 86 fits into 200 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 5112.37209302
Subtracting 172 from 200 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

After the division, we end up with 5112.37209302 and a remainder of 2.8e-08.